Let's say thing straight here.
I will talk about the Catholic practice of asking Mary, saints and angels to pray for us. The Bible directs us to invoke those in heaven and ask them to pray with us.
Thus in Psalm 103, we pray, "Bless the Lord, O you his angels, you mighty ones who do his word, hearkening to the voice of his word! Bless the Lord, all his hosts, his ministers that do his will!" (Ps. 103:20-21).
And in Psalm 148 we pray, "Praise the Lord! Praise the Lord from the heavens, praise him in the heights! Praise him, all his angels, praise him, all his host!" (Ps. 148:1-2)
Not only do those in heaven pray with us, they also pray for us. In Revelation, John sees that "the twenty-four elders [the leaders of the people of God in heaven] fell down before the Lamb, each holding a harp, and with golden bowls full of incense, which are the prayers of the saints" (Rev. 5:

. Thus the saints in heaven offer to God the prayers of the saints on earth.
Angels do the same thing: "[An] angel came and stood at the altar [in heaven] with a golden censer; and he was given much incense to mingle with the prayers of all the saints upon the golden altar before the throne; and the smoke of the incense rose with the prayers of the saints from the hand of the angel before God" (Rev. 8:3-4).
Jesus himself warned us not to mess with small children because their guardian angels have guaranteed intercessory access to the Father: "See that you do not despise one of these little ones; for I tell you that in heaven their angels always see the face of my Father who is in heaven." (Matt. 18:10).
Because he is the only God-man, Jesus is the only Mediator between man and God (1 Tim. 2:5), but this in no way means we cannot or should not ask our fellow Christians to pray with us and for us (1 Tim. 2:1-4), including those Christians in heaven, who have already had their sanctification completed, for "the prayer of a righteous man has great power in its effects" (Jas. 5:16).
I would be willing to bet they do not even examine the prayers we use to 'petition' Mary. Have you ever heard of the word 'intercession'? It is when we ask someone to pray for us. Lets look at a few Bible verses...
Rom 15:30, "...help me by your prayers to GOD for me."
Col 1:9, "This is why we too have been praying for you unceasingly."
1Thes 3:10, "Night and day we pray more and more..."
2Thes 1:11, "To this end we pray always for you."
2Thes 3:1, "In conclusion brethren, pray for us..."
Jam 5:16, "...and pray for one another that you may be saved."
Rev 8:3-4 "...that he may offer it with the prayers of all the saints..."
The Bible is asking you to pray for one another. Have you ever asked someone to pray for you? Have you ever told someone you will pray for them? Why then, when the name of Mary is introduced, is it not to be asked of her? Was she not a created being like all the rest of us? Why can we ask everyone else to pray for us, but we can't ask it of Mary? Does it not stand to reason that her Son would listen to her and grant her requests?
He turned water into wine at Cana just by Mary making a remark, "They have no wine", Jn 2:3. He was subjected to her in Lk 2:51, and no doubt for many years until His ministry started at age 30. He listens to her now, just as He did then. She must have a lot more influence with Him than any of us do, since she is His mother.
Let us see what Catholics pray.
Have you ever listened to the words of the most used Marian prayer of all, the Hail Mary?
*** "Hail Mary, full of grace, the Lord is with thee." ***
This is nothing more than the salutation of Gabriel in Luke 1:28.
*** "Blessed art thou among women, and blessed is the fruit of thy womb (Jesus)." ***
That is Elizabeth's greeting to Mary in Lk 1:42.
***"Holy Mary, mother of GOD." ***
She is a saint which makes her holy, and she is the Mother of GOD, because Elizabeth calls her the 'Mother of Our Lord' in Lk 1:43. Also if you take Jn 1:1 "...and the Word was GOD', and add it to Jn 1:14, "...and the Word was made flesh", GOD was made flesh, and who was His mother? Mary!
*** "Pray for us sinners, now and at the hour of our death, amen." ***
This is nothing more than petitioning Mary to PRAY FOR US, just like in the Bible verses I presented. Do we 'pray to' Mary, or are we only petitioning her to pray for us?
Now the next question is, 'Yes, but it is repetitious (the Rosary) and that is forbidden by scripture'. (Mt 6:7)
OK, look at the entries listed above which have the asterisk (*) in front of them.
Are not Col 1:9, "This is why we have been praying for you unceasingly...", 1Thes 3:10, "Night and day we pray more and more...", and 2Thes 1:11, "To this end we pray always for you...", repetitious? Is this one of those so called 'Bible Conflicts' you hear about from time to time?
No, not at all. The answer is that the Bible refers to two types of prayer repetition 'Vain', in the manner of heathens, and 'Useful', NOT in the manner of heathens.
The Rosary is not vain repetition. Here is a list of some in each category that you can check in your Bible.
(V) 1King 18:25-29, (U) Isa 6:3, (U) Dan 3:52-90, (V) *Mt 6:7, (U) Mt *26:44, (U) *Lk 6:12, (U) Lk 18:1,9-14,*21:36, (U)*Col 1:9, (U) 1Thes 3:10,5:17, (U) *Jam 5:16, (U) **Rev 4:8
One final note:
Many non-Catholics have the false belief that praying to "dead" people is useless. This is a mis-interpretation of what Holy Scripture teaches us, for the Blessed Virgin Mary and others who have gone on before us are not dead but live forever.
The Scriptures tell us that we pray to God through Jesus in the Holy Spirit -- this is Saint Paul's great insight into the nature of specifically Christian prayer.
Theologically, Catholics believe that if our prayer is directed to God the Father, we are simultaneously praying to the Son and to the Holy Spirit; if our prayer is directed primarily to Jesus, we are simultaneously praying to the Father and to the Spirit; and if our prayer is directed primarily to the Holy Spirit we are also praying to the Father and the Son.
Since the Holy Trinity is a divine community of Persons, prayer directed to One of the divine Persons -- Father, Son, Spirit -- reaches the other divine Persons; the Father shares everything with the Son and the Spirit; the Son shares everything with the Father and the Spirit; the Holy Spirit shares everything with the Father and the Son.
So, yes, Catholics pray to Jesus as the Second Person of the Most Blessed Trinity.
We have many ways, as Catholics, of talking about this aspect of our prayer.
To be a Christian means, among other things, accepting Jesus into your life. Mary literally accepted Jesus into her life for when she said "Yes!" to the archangel's invitation and the Holy Spirit overshadowed her, Jesus made His home in her womb. So, for Catholics Mary is the First Christian, the first human being to accept Jesus Christ into her life.
As the First Christian, she is, so the speak, the Prototype of what being a Christian means. In that role, we Catholics feel that Mary has something like a "first among equals" role as exemplar for us.
So, we Catholics feel very comfortable going to her in prayer for guidance and help since she walked this road of living the Christian life before anybody else. When we pray to her, we are, in a sense, asking for her wisdom and insight about how to live our Christian lives more perfectly; since she's already done it, we look to her for example, direction and guidance.
Another way that we Catholics think of our practice of praying to Mary is the following. We are perfectly comfortable as Christians asking other Christians for prayer support when we are confronted by special needs, crises, or stressful circumstances. Calling up a Christian friend and saying, "Please pray for me, I'm going through a really tough time" makes complete sense to us.
Christians also believe that death is not the end of life. Death is a 'door' through which we pass, as we move from one room in our Father's Mansion, the room of this life, to another room in the Lord's House, which is the room of eternal life. The dead in Christ are surely alive!
Mary, as the First Christian, is, then, alive in Christ -- sharing the glory of heaven with her Son and all those to whom God has given eternal life.
So, when we Catholics pray to Mary, we are simply saying that since she is alive in Christ in the glory of heaven, we can go to her, asking for her prayerful support -- in much the same way that we would ask a Christian in our Church community to support us with his or her prayers.
The fact that Mary is alive in life-beyond-death in no way minimizes her ability to pray. In fact, we Catholics would say that since Mary is with her Son, her prayers have a special kind of efficacy and power.
Another way that Catholics talk about praying to Mary builds on the idea of a special bond between a parent and a child, and particularly on the bond between a Mother and her Son. In many human relationships, a mother has a special role in the life of her children. Mary, being such a magnificent mother, and Jesus, being the Perfect Son, surely had a marvelous and ultimately close relationship. When we Catholics pray to Mary, we are simply assuming that the closeness between this Mother and her divine Son continues in life-beyond-death, and we are asking this special and wonderful Mother to speak to her beloved and divine Son on our behalf.
A last word about the way Catholics see our prayer to Mary: When we pray to Mary, we Catholics are, essentially, saying, "Blessed Mary, you are living in the very Presence of God, would you please take my request, my prayer, and put it before God Who chose you to be the Mother of His Son?" We are acknowledging that, as the Bible says, all generations call her "blessed" precisely because God offered her a unique role as the Mother of Jesus and because she accepted God's invitation. That intimacy which Mary had with God continues in the glory of heaven. When we Catholics pray to her, we are simply saying, "Please ask God to hear our prayers now...and at the hour of our death!"
Does a Catholic HAVE to pray to Mary? No, we don't HAVE to pray to Mary. But, praying to Mary is one of the greatest gifts the Catholic Church has to offer us -- so why in the world wouldn't we accept this magnificent gift?!? While we don't have to pray to Mary, most Catholics WANT to pray to her because she is special to God, special to God's Son, and she, therefore, very special to us! We never 'worship' Mary -- "worship" is what we give to God alone. But we do have a very deep love and a very high regard for this blessed woman!
Sometimes, when we pray to Mary, we talk to her. Sometimes, when we pray to Mary, we just think about her and her Son. When we use the Rosary, ...
Why do Catholics pray to Mary? Is it not better to pray directly to God? Why do we call Mary the Mother of God and not the Mother of Jesus? ...
. Protestants could then say, in effect, "even though our beliefs conflict at every turn, and therefore cannot really be true, just look at the even GREATER untruths that exist in Catholicism! Therefore we are in a better place." This argument is about as close as any Protestant can come to justifying the plague of denominations which the original Protestant rebellion spawned, in direct opposition to the will of Christ, Who stated His divine intent that all Christians would be ONE, even as He and His Father are ONE. Protestants therefore do not wage their attacks on traditional Christian truth out of spite or hatred, or even jealousy, but rather out of a desperate quest for a legitimacy which is objectively lacking in their religious tradition. The bizarre accusations they bring against God's Church - worshipping statues, making human beings equal to God, adopting pagan beliefs, etc. might possibly legitimize such a rebellion, if any of it were true.
Blessed art thou amongst women and blessed is the fruit of thy womb, Jesus.
Holy Mary, Mother of God, pray for us sinners, now and at the hour of our death. ...
So let's stop talking bullshit