[TWOIAF Spoilers] Inconsistency or Intentional?
As was noted in another thread, there seem to be slight inconsistencies every now and then in the World of Ice and Fire. That's not so strange, as it is a huge project, and keeping everything straight must be difficult after a while, especially when multiple people work on the same project. A second thing to consider, is: is it truly an inconsistency that you spotted, that could potentially be fixed in a second edition/online edition? Or, as happens on occasion in asoiaf, is it intention
GRRM's response at Asshai is sort of in error -- bear in mind that a third party was translating questions in Spanish to English for him, and it may be that the translator said "Targaryens" rather than Aegon. Yes, the Targaryens adopted the Seven as a political maneuver, but because of this Aegon was a follower of the Seven (at least nominally; truth be told he seems to have been pretty irreligious) from infancy. And Aegon certainly had the High Septon crown him as a political maneuver as well,