Wow, I've received frighteningly little interviewer training, but the "things to not say/consider" talking point has been reiterated strongly. That said, I can't say I'm surprised.
But that wasn't really a big deal, I was used to HR reps at that company not understanding anything about benefits.
The kicker was that her profile picture in the email was her in the company bathroom, taking one of those "hold the camera up in the air to accentuate cleavage" type photos.
I didn't even want to keep her her email open too long...
Religion is off-limits in the US.