I'd be picking myself up off the floor, like Rockhead, and putting it together as others have suggested. Only difference might be that I would likely say "Some people believe... I believe... There are others that believe... But, basically you are correct ...then add what dlowan said." I would avoid the "We believe..." just so he doesn't feel included in the "we" and like he doesn't have a choice.
I'd probably also ask questions to see what he believes at this time and leave the door wide open. If at some point he chooses to believe as Christians, Muslims, or Orthodox Jews, he won't want to feel he is betraying you or that you will be critical or disapproving.
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