In the campaign where I'm currently playing, a majority of the PCs worship the same deity and knew each other prior to the start of the campaign.
One player, however, is playing a character who was not part of this.
We did give him a chance to though.
Normally, this is not a problem, however, when the party has a conflict of interests, he often still does what he wants to, splitting the party. This usually ends up wasting time. Next time we play, we are going to come across a temple of the deity most of the PCs worship that has been run over by orcs. My fear is that, while we repair the temple like the devout people we are, he will leave and do his own thing, rather than stay and do it later, splitting the party, and using up more of our DM's precious time.
How can I, as a player, encourage him to not split the party whilst still letting him have fun and do the stuff he wants to?