THE HOLY GHOST is GOD THE FATHER's very Presence in us

HOLY GHOST IS NOT A THIRD PERSON OF GOD

HOLY GHOST is to God.
As the Spirit of Man is to Man.

1 Corinthians 2:11 KJV
For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God.

The Spirit of Man bears witness as well as the Spirit of God.

Romans 8:16 KJV
The Holy Spirit itself beareth witness with our spirit, that we are the children of God:

Jesus said that the Holy Ghost is the Spirit of His Father and His Father's Presence in Him.

John 8:16 KJV
And yet if I judge, my judgment is true: for I am not alone, but I and the Father that sent me.
Matthew 10:20 KJV
For it is not ye that speak, but the Spirit of your Father which speaketh in you.

Jesus said that the Holy Ghost is His Father's dwelling and working in him.

John 14:10 KJV
The words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works.

Ghost
Sounds scary...