It is cool lore -- but I have a hard time rationalizing two distinctly different Aengudaemons as sharing worshippers and magic. Tahariae and Aeriel are neat and they do both represent a spectrum of "virtue" and "light", but the concept is strange and hard to wrap my head around lore-wise. I like the magic and its mechanics, though. No trouble there.
Best of luck. I'd like to see more holy magic around, and this has the potential to be just that. I only hope the origin story gets thought out a little more!