oompa
If she left you over a difference in beliefs, then she's not the "perfectly good woman" you imagine her to be.
There's no domestic violence, no spousal abuse on your part, no vices that are putting your health and/or finances at risk. It sounds to me like she left a "perfectly good" man for Jeeeehoooover, the god who makes promises he doesn't keep, the god who demands that you sacrifice your children rather than 'pollute' them with blood transfusions and the god who requires all of her time, emotions and resources. She's been having an emotional affair with Jehovah right under your nose, and she chose him over her marriage.
I hope one day you'll see it this way and realize that you deserve better than that.