Auriel is important. Look at the statues in the game. An elf in ELVEN armor ascending to heaven with a bird coming from his shoulders, trampling Oblivion, which is below him.
The Ayleids loved that snazzy stuff so much that they put Daedric armor on their statues of Auriel?
Perhaps the question is why elven armor looks the same when they weren't united. And as I said before, it's very possible that those statues, and most elven armor, were built after Umaril was killed; the Ayleids existed in Cyrodiil for quite some time afterwards. After all, Umaril was killed very early on, his death didn't signal the end of the Ayleids.
Regardless, I don't wee why this is worth continuing when you don't seem to have the guts to actually own up to the idea and tell me that you believe it happened, instead of wrangling over whether it could have happened, which lies on the sixteenth tier or chronic pointlessness. If, at this moment, you feel like pointing out how speculation, opinion, and arguing over unprovable aspects of fiction is pointless, then take your own advice and leave.
First, you started this debate with me. As is the case with almost every debate between us. Second, I do believe that there was Daedra worship among the Ayleids, even if it wasn't the dominant religion. Third, I'm not going to concede to the idea that there was no Daedra worship among the Ayleids, which is what I've been arguing for. Fourth, neither you nor I are willing to concede to the other.