I admire your perseverance, and love.
You are right - your husband does need God!
The first step is your love and faithfulness to him.
This is not a guarantee of success but you are likely his only credible witness to the grace of God.
You are the one who is in the situation right now, and so obviously, you need to evaluate the situation.
If you feel in danger yourself, or for your children, I would not stay though.
I just want to encourage you and remind you that God both knows and understands your situation.
The hand of grace is extended.
Let us know how you go...