"Being born again, not of corruptible seed, but of incorruptible, by the word of God, which lives and abides for ever: But the word of the Lord endures for ever. And this is the word which by the gospel is preached to you."(1 Peter 1:23,25)
"So then faith [comes] by hearing, and hearing by the word of God."(Romans 10:17)
"And it came to pass, as he spake these things, a certain woman of the company lifted up her voice, and said to him [Jesus], Blessed [is] the womb that bare you, and the paps which you have sucked. But he said, Yea rather, blessed [are] they that hear the word of God, and keep it."(Luke 11:27,28)
"For this cause also we thank God without ceasing, because, when you received the word of God which you heard of us, you received [it] not [as] the word of men, but as it is in truth, the word of God, which effectually works also in you that believe."(1 Thessalonians 2:13)
So those who would call themselves Christians should receive the words of the Bible to be "by inspiration of God," and not as words of man. Here is what the Bible says about itself:
"All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:"(2 Timothy 3:16)
He was not in any way a Christian according to the Bible and gospel he decided to rewrite.