Jefferson's Bible

[Wyrd of Gawd]

Which experts tell you the beloved John actually wrong the Gospel of John? And based on what evidence, knowing that it wasn't ascribed to John until at least the second century?

Whoever wrote the Gospel of John also wrote 1, 2 and 3 John and obviously lived at the time of Jesus and was close to him.  This is evident in reading the first four verses of 1 John.

1 John 1English Standard Version (ESV)

The Word of Life
1 That which was from the beginning, which we have heard, which we have seen with our eyes, which we looked upon and have touched with our hands, concerning the word of life— 2 the life was made manifest, and we have seen it, and testify to it and proclaim to you the eternal life, which was with the Father and was made manifest to us— 3 that which we have seen and heard we proclaim also to you, so that you too may have fellowship with us; and indeed our fellowship is with the Father and with his Son Jesus Christ. 4 And we are writing these things so that our[a] joy may be complete.

So the writer was best buddies with Jesus and he wrote some stories about him.  Considering all of the wars and assorted disasters in the area I wonder how those manuscripts survived?