Only believe, 

But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.

John 1:12,13 KJV

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, and after he brought them out, he said, "Sirs, what must I do to be saved?"

They said, "Believe in the Lord Jesus, and you will be saved, you and your household."

Acts 16:30,31 NASB

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"But if you can do anything, take pity on us and help us."

"'If you can'?" said Jesus. "Everything is possible for him who believes."

Immediately the boy's father exclaimed, "I do believe; help me overcome my unbelief!"

Mark 9:22b - 24 NIV

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Thanks be unto God for His wonderful gift:
Jesus Christ, the only begotten Son of God
is the object of our faith; the only faith
that saves is faith in Him.