A misleading claim...
Christianity predates the compilation which includes new testament cannon...the Old Testament writings were mostly already agreed upon before Christ.
Given that christ came in fulfillment of old testament writings, this claim isn't accurate.
Christ fulfilling prophecies of the Hebrew Scriptures is irrelevant to the point that Christianity predates the writing of the New Testament, much less its canonization. And of course, Judaism existed before the Hebrew Bible was written.
I'd suggest that whoever thinks this way doesn't understand the old testament sanctuary service at all.
One has nothing to do with the other, as far as I can tell. Whoever thinks that the New Testament produced the Church, rather than the Church producing the New Testament, doesn't understand much Church history (much less earlier Jewish history).
What the O.P will find is that its Theistic Evolutionists within the Christian movement who deny bible inerancy. Creationists will usually take the view its the inerrant inspired word of our Almighty Creator.
That isn't universally true. A text not being literal is not the same as it containing errors. Unless you think Jesus was telling you he's a plant when he said he is the vine?