[Cohen]

Marignon for sure.
Cheaper priests, inquisition bonus.
Don't forget that to benefit from CF bonus it should be already your dominion, so the inquisitors keep up your dominion if needed, meanwhile your sneaking Friars fries the enemy dominion.

But if you aim to a dominion push, try Abysya, Vanheim or Mictlan. Blood Sacrifice is very effective, far more than preaching, for what I know (assumed you've a good blood economy and a nice amount to scout to make a supply line from your temples and labs.).