Scientology VS Christianity currently tied

This very interesting discussion died out in the previous thread without conclusion.

I said there was no evidence for Christianity
Bluffthis said there was no evidence for Scientology

Bluffthis this cited a book: "The Bible" as evidence for Christianity

For Scientology, another book: "Dianetics" was presented as evidence of the real spirutual history of Humanity.

Has anyone got anything to add to this discussion, or are we to conclude that both religions are equally credible?