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I'm sorry to hear that you are going through so much!

Have you tried talking to him about what is going on? This is pretty serious since he is insulting you too. You can start off by saying that you feel hurt when he says these things (be specific) and you want to work with him to solve the problem. You can also say that you've noticed that he's been acting differently (Again, be specific) and you are wondering if he's okay.

He may not want to talk things through, or if he does, things may not change. At this point, I know that you don't want to let him go, but you may have to. While people of two different religions/beliefs can get along and date just fine, other times it just doesn't work. You also don't deserve to be with someone who constantly is insulting and arguing with you. You deserve better than that.

Don't blame yourself for him not wanting to be sexually active, either. It's something you can bring up if you do talk to him, but it's not your fault.