I already pointed out that the doctrine of the divine preservation of Scripture was thoroughly undermined. How? We were told to believe that only in the late 19th century was the true Word of God discovered in a handful of corrupt manuscripts (Aleph, A, B, C, D, and E). That was a blatant lie therefore an elaborate theory was cooked up to support it. So how did God preserve His Word? Through faithful copying by scribes and monks. Who corrupted the Word? It was the Gnostics who did so. So now Christians are using bibles based on Gnostic corruptions. I will give you just one example, because it will cause you (and others) to search for all the other corruptions.
JOHN 6:69 ALTERED AND CORRUPTED
As an example of how doctrine can be changed, we take John 6:69 and analyze the changes made to it: “And we believe and are sure that thou art that Christ, the Son of the living God”, has been changed to “And we have believed and have known that thou art the Holy One of God” (Nestle, RSV, NEB, JB, NAS, NIV). Here's how your favorite NASB puts it: And we have already believed and have come to know that You are the Holy One of God.”
(a) “we believe” changed to “we have believed” – by putting this in the past tense, it implies that this believing is not a continuous and continuing faith and trust, but something that occurred in the past;
(b) “and are sure” vs “and have know” are two different things. To know something does not necessarily mean to be sure of something, but Peter stated on behalf of himself and the apostles that they were sure, they were certain, they were positive, they were unshakeably convinced;
(c) “that thou art that Christ, the Son of the living God” is an unequivocal declaration of the Deity (Godhead) and eternal Sonship of Jesus the Messiah. Christ is called “the Holy One of Israel” or “the Holy One” consistently throughout Scripture. However, “that thou art the Holy One of God” was an expression used only by unholy demons when fearfully addressing Christ with full knowledge of their judgment and doom (Mk. 1:24; Lk. 4:34), and not once do we find the apostles addressing Christ in this manner. Thus the words of demons have been put into the mouth of Peter, and there is a huge difference between the two statements. Therefore several Bible doctrines have been changed very seriously through these few alterations. When this is repeated over and over again throughout the Scriptures, we can be sure that Satan is behind these changes.