How hard is it to believe something? It is the easiest thing in the world, people readily believe lies, you believe that Christ is not the Son of God, that he is not God manifest in the flesh, which is a lie you believe. If you can believe lies you can believe the truth, you don't want to believe Christ because you are evil
John 3:20 KJV
[20] For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved.
But what you don't realize is that once you believe you are saved for ever and can do nothing to lose your salvation,
Hebrews 10:12,14 KJV
[12] But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God; [14] For by one offering he hath perfected for ever them that are sanctified.
and
John 6:47 KJV
[47] Verily, verily, I say unto you, He that believeth on me hath everlasting life.
and
Romans 10:9-10 KJV
[9] That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. [10] For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
It's not the prayer that saves you, it is the belief, if you believe that Jesus Christ died for your sins, was buried and rose again the third day and you make that known to God by confessing it you are saved for ever and can do nothing to lose your salvation. God will still punish you in this life but he will never take away your name out of the book of life
Just believe for your own sake
Psalm 34:8 KJV
[8] O taste and see that the Lord is good: blessed is the man that trusteth in him.