allow back into the church or should they be ban from attending that church?
I disagree about the second comment. God allows all people who are sick. If they don't want to come, you let them be and let them burn their own world since they don't want His help. Hey, you can't save the ones that don't want to be save. You can't force them yo. That ain't right. If they want to die, then you give it to them. If they don't want to die, you save them.
You must think it in a superhero/super villain way because if you could think in that kind of situation, then you could understand the problematic about Lucifer and God. Lucy is trying to win against God by playing God's game. How do you win against a super being in their game? Read about Jesus who fault against the devil in the desert for 40 days.
The 40 days is also mention in exodus when Moses was taking his people out in the desert. Jesus did it because it was moses who was trying to interpret about the coming of the messiah.