You are close, but I don't believe that it is GOd that she has replaced me with.
Does she view divorce the same way you do?
So. You are feeling jealous...let me take a little side trip before I continue...
I'm sure God is in the mix there, somewhere, for if He hadn't made all those rules about marriage, you wouldn't be having so many problems... and because of your faith, you probably stuff those feelings, for it isn't pious nor pure of heart or thought to be angry at God. But. It's safe to be angry/jealous of your wife. Now. That is PURE conjecture on my part... but perhaps consider it. I've seen it happen to many devout families.
Let me ask you this. Do you like/enjoy feeling replaced and jealous? I'm going to assume no. Correct me if I am wrong.
Those are two feeling you can get a grip on and change (not necessarily what's causing the feelings but the feelings themselves). Do you want to do that?
