Thanks for your comments everyone.
His "religious delusions" are a small concern compared to his physical and mental condition, but I do find that they are distracting him greatly from taking care of himself. When we talk I wanna tell him to focus on getting better, but he feels its all unimportant now that he has these amazing new spirtual "realizations". Its difficult talking to someone in his state, you have to pick your words carefully, which is hard because that was not what our friendship was before.