Actually you don't need to exterminate anything, if you follow my method...
Pick one province to produce priests from on the FIRST turn of the game. And have it produce a priest basically every turn. Send them all to the holy land. B y the time they get there they will have gained some skill from travelling (And from taking out any heretics you see along the way of course). Plant one in Antioch, one in Acre, one in Jerusalem, one in Aleppo, etc.
Now by the time the first crusade is called they'll likely all be cardinals and the regions will all have 40-60% catholicism. Attach a spy to your crusade army and send them off.
You'll have no problems at all.
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