I'm pretty sure that's the point of the comic. He is a cartoonishly specific type that this woman is looking for, even the absurd aspect of him having a lobster head that we are shown most people do not have (obviously), and he discards her as a prospect over potentially superficial differences in religious belief.

I wouldn't call my foreskin a minor adjustment!

I mean, yeah, but if he wants to raise kids in Judaism, she'd have to convert. It's not an... insurmountable hill, I have family friends like that, but it does certainly make it tough.

Playing dangerous games if you are a literal believer. I've heard of it working, but it certainly doesn't seem to be the norm

Then why do I see so many clips of jews spitting on christians?

I think it's probably the "smart" in the ad and she's Christian.