Be all end all argument.

I've been saying this for years and I really get no push back because it's absolutely true. "Hey look, I've never doubted the word of god, I just doubt the word of man. Man says there's a god. Different men say there's different gods. Man has lied to everyone including me since history has been recorded. God hasn't said a word to me." Depending on who you're talking to that should at least get them to thinking and if worse comes to worst you can say hey, give me an ounce of evidence and I'll give you a pound of faith. (Until then STFU)