How can it not be heretical? Cra'ithil adherents are always skulking about in the shadows instead of in the light of the Aenil, and they proclaim the teachings of a false prophet who even claimed to be an Aenil herself!
Ummm sure okay. The prophet was male, and he never claimed to be an Aenil, but you go with that
I also seem to recall that the position of our Aenil was ratified by several members of the MAE, we simply chose to follow a single Aenil, much the same as Paladin Jenred chooses to follow his patron Aenil.