There's some verses in the Bible that tell you to be wary of those that come dressed clean and godly, that pray in public, and make a spectacle of their worship.
I forget exactly the words but it is basically that yeah, they're filthy and ungodly inside.

I am convinced most people aren't religious, or at least agnostic. If they truly were they'd not be living like they are and wouldn't give a shit about anything but their holy book. I call it being alibi-religious.