Thank you for your post. I am very sorry for your situation. It is hard to not be able to "fix" this situation.
I am very grateful that my H is still home and is not mean. However, the change in him has been so drastic it is difficult to be an observer.
I am a Christian. I didn't grow up in a Christian home, but my H became involved in church as a teen (on his own...major FOO issues and he was seeking peace). We have always been involved with our church. We both have leadership roles (though in the Jim Conway described fashion, my H has slowly moved away from his roles to mostly just a bystander). We still attend church and Bible study as a family every week. With the exception of one single friend (his concert buddy), my H only socializes with our married, Christian friends. I have often thought he is purposely keeping himself in check by the company he keeps....though I really don't know.