That's honestly a terrible party for the Prophet. Reason being, with that comp you'll be forced to tear down the pews, before you can start getting any real damage on him. Meanwhile he'll be Rubble bombing the utter shit out of your team, against which you have no counters. I doubt they'd survive.
My plan is strategy is two part. First phase, is to debuff his damage to the point you can ignore it. Thus enters the Occulist, with his Weakening Curse. The other part, is to bring a Man-at-Arms, so he can guard at least one person getting the rocks, until you the Prophet i stacked with debuffs.
If I'm going straight after the Prophet, ignoring the pews for the most part, I take: Occulist/Grave Robber/Highwayman/Man-at-Arms.
If going after the pews, something like: Occulist/Bounty Hunter//MaA/Hellion