Well, some folks just lie. If they are against Christ and the Gospel, they will lie. They will say that no one of intelligence believes the Bible is the true Word of God, yet there are many extremely intelligent and highly educated people who believe so. Christ himself told us to beware of these folks, listen to what He said in Mathew:
:15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
(King James Bible, Matthew)
Listen to Paul in II Corinthians:
11:13 For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ.
11:14 And no marvel; for Satan himself is transformed into an angel of light.
11:15 Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works.
(King James Bible, 2 Corinthians)
And John:
1:7 For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.
1:8 Look to yourselves, that we lose not those things which we have wrought, but that we receive a full reward.
1:9 Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.
1:10 If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed: 1:11 For he that biddeth him God speed is partaker of his evil deeds.
5:13 These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.
(King James Bible, 1 John)
And Peter:
1:16 For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.
(King James Bible, 2 Peter)
And Paul again:
26:26 For the king knoweth of these things, before whom also I speak freely: for I am persuaded that none of these things are hidden from him; for this thing was not done in a corner.
(King James Bible, Acts)
Study Christian Apologetics, they will show how the gospels were copied in great numbers, how they agreed, how people would spot a change, a deception right away. They will show how God's Word was preserved for us, for they were written that we may know we have eternal life, and this life is in Jesus Christ. I would leave two more verses for you:
15:3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; 15:4 And that he was buried, and that he rose again the third day according to the scriptures: 15:5 And that he was seen of Cephas, then of the twelve: 15:6 After that, he was seen of above five hundred brethren at once; of whom the greater part remain unto this present, but some are fallen asleep.
(King James Bible, 1 Corinthians)
10:1 Brethren, my heart's desire and prayer to God for Israel is, that they might be saved.
10:2 For I bear them record that they have a zeal of God, but not according to knowledge.
10:3 For they being ignorant of God's righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteousness of God.
10:4 For Christ is the end of the law for righteousness to every one that believeth.
The last is so we know, we do not earn salvation by our works of righteousness, which are filthy rags to God, but salvation is freely given to sinners who accept Christ's righteousness in place of their own, in His death in place of their own for payment of sins. This is the True Gospel. Do not be afraid of mere men who would undermine your faith. God loves you and will never leave you, Jesus will never forsake you and is your advocate in Heaven, He keeps you and loves you and will never let you go, no matter what. He has "saved to the uttermost those who are being made holy."
I hope this helps somewhat, but you must study, get rooted and grounded, so you know that you know that you know you are saved, and that the Word of God is true, and you can count on it for guidance and for your final authority. God be with you and help you.
Mike