In my opinion, it is best if you accept his sexual orientation completely and tell him so. Even if it's not true, maybe it WILL be true one day, and if he feels badly about it, this could help him a little bit. I would not push him to have a religion. So many are very unfriendly to gay people and he probably feels more ostracized when he participates. Maybe one day he will find a way to keep some religion in his life even though he is gay. I could be wrong, of course, on all of this. It is my opinion and a different culture from yours.
In the end, it is up to him to decide to get help and do what he needs to get well. Again, if he is a legal adult, there is really nothing you can do for him. He has to do it himself. Maybe if you back off he will go for help again. What I mean is...if you are begging him to go or nagging him to go sometimes that can backfire.
More hugs for your hurting heart.
