You are told to be wary of no n jws. I suspect that he is trying to distance himself because although you are his friend you will not be on the guest list for his wedding. He knows that you may have expectations that you would be invited but he doesnt want to explain why he invited a worldly non relative to the wedding. He would rather avoid the conversation and be distant than fess up that his religion is making him behave like an arse.
You can get rid of the elephant in the room by saying I am happy for you, I know that you may not be able to invite all your friends as family takes priority but I will be thinking of you and hope you enjoy your day.
s