For me, smokin' the herb is often an intensely spiritual experience. Now, I myself am not Christian but am what I consider to be a spiritual person, opting to follow a path similar to Wicca. I hardly think that marijuana distances you from God or the 'higher power', rather that it brings you closer. And if this guy starts Bible Bashing you or telling you that everything about cannabis is wrong, simply tell him that you find yourself closer to God and your soul whilst smoking marijuana. If he's still getting stuck into you, offer him a bowl and if he somehow accepts, get yourself in the most chilled settings possible and meditate or peace out. If he's still telling you that marijuana is devil's work, then he's fucking crazy.

Peace