Me: How do you know that this almighty God exists?

Other: The Holy Book tells us so.

Me: I understand that, but that was written ages ago. How do you know it's even based on fact?

Other: The Holy Book tells us so.

Me: Yes, yes, I know. But ponder for a moment the possibility of the Book just being a story, nothing more. I mean how can you base your evidence of the truth of the scriptures, on the same scriptures? Maybe they're lying, how would you know?

Other: It is the truth. The Holy Book tells us so. *starts quoting and speaking in tongues*

Me: *bangs head against wall and counts to a zillion*