Because it gets Allison to be on their side?
I thought the spreading of religion was forbidden in Aurvandil, I don't know if it was because it's another kind of power that in a certain moment could mean some rivalry for the monarchic regime or if there's another reason. However, if they're allowing it to happen I guess is somehow because of the reason VonGenf says.
Maybe not to have Allison within their ranks, she has probed to be a quite ambitious character, which in a realm with such strong and restricted hierarchy seemed to have not room. But as Dustole said, she was well accompanied in number of acolytes and funds, and whether Aurvandil is strong, it's never so bad to have a bunch of new nobles with some experience and filled pockets.
