Sigh. Yeah religion - beliefs can sure get in the way of a friendship eh? Maybe there is another position you can hold in his wedding.. though I'm not sure why a best man can't be a non member! go figure. Sometimes church traditions... I'm surprised you were allowed to be married in the church yourself, without becoming Catholic as your wife! hmmmm that's a new one to me... but then... I'm not up on all of it anymore.

I don't know how far you wish to pursue this (cub scouts was a long time ago!) are you willing to let it go and still be friends, are you willing to maybe find out what he says isn't totally true (if it isn't) .... will it make a difference?