fortunately, your son has you. You have a window open for him, to get an open mind and heart. Hopefully, somehow you can present to your son simply that it is just his mom's religion but that you don't feel that way. Hopefully, you can present to him the alternative. But, hopefully, you can teach him respect for his mom also. It's a tight-rope walk, but it is possible.
(I don'.t know your whole story, I can't keep track of all the ones here)