He's a guy's guy so it pretty much became like the impressions - don't imitate Sean Connery's voice and things like that. We were all kind of doing it towards the end of the film anyway and he was cool with it.
Belief is a wise wager. Granted that faith cannot be proved what harm will come to you if you gamble on its truth and it proves false? If you gain you gain all if you lose you lose nothing. Wager then without hesitation that He exists.