I thought this would give a more strategical approach to avatar defense. Could be like playing rock paper scissors that you have to scout what god your enemies are worshipping and then you can prepare for that.
Also please make the gods jealous, let them get angry when players worship them in the wrong way or neglect them. Let the purge strike with plagues and an avatar if you have enangered a god. I think it would be cool that this happens to you if build T3 Altars of several gods.
I think this could combat some balancing flaws in the religious system in a fun and immersive way. Right now I see big issues with the overpowered bubbles as well as with the ridiculously easy token farming.