God's domain is not limited to earth. People must remember that Christianity, as well as the other two Abrahamic religions, are REVEALED RELIGIONS. When revealed, they were written in a fashion suited to that time period; If the New Testament, for example, refered to extraterrestrial human life, nobody would understand it. God only reveals what needs to be reavealed, and people need to understand that.
muhammedism is not a revealed religion it is a vile, filthy death cult that worships objects. It is the primary group of people for whom hell is made.