The real question here is not if you should devorce him but instead should you teach him about god? Now what you must think about is how much do you know about god? And are you sure in what you know? They best thing and only thing you can do is to pray for him. You should do like Muslims and pray 5 times a day. If god wills it this man will get up one day and accept god, you are asking him to have an open mind about a subject that christians do not have an open mind about. And I know this cause many christians curse other religions all day long, if a jehovah witness come up to you you probably run them off. If a Muslim tells you god is one or calls him Allah you call him a hethen or a disbeliever! At the end of the day you are not god so you can not make him do anything if he brings you joy then love him for that if you makes you *** then love him for that if he listens to your words then love him for that don't love him cause he likes your dogma!