If Bush is really the third Anti-Christ, you first have to prove:
a) Christ existed.
b) Christ was divine.
c) There is reason to believe multiple Anti-Christs would come after Christ.
d) Two men in history were, without a doubt, Anti-Christs.
e) Bush is also, without a doubt, an Anti-Christ and not a loyal Christian like he claims.

So far, I have not seen any conclusive evidence for any of those five statements.