it personally doesn't make sense how coming up with new religions is against the settings. People think differently, and nobody has the same exact beliefs on every single little issue. Eventually people that do have common beliefs to each other, but different from the norm for their own cults or religions. Take for example scientology as a OOC example. Even wackos have the right to believe what they wish, and in the laws of hydlaa, i'm pretty sure there is freedom of religion. Therefore, how can it possibly be that over such a long time people start to no believe in the gods of Laanx and Talad especially since they left the realm of Yliakum [which is why we can choose Atheism as a religion at character creation]? From this people would start looking towards things they see, or know to exist, such as the Azure Sun/crystal. Remember the Cult of the Dark Crystal that a group of players formed and was well played while it lasted imho? According to the settings team, it was against the settings.
So the question then becomes: Do the people of Yliakum have the capability to think for themselves, outside of the box, and to question their surroundings, especially when the lore of laanx and talad is so old and has the potential, in the eyes of the inhabitants of yliakum, to have been stretched or altered as time went on? Or does everyone either praise talad, laanx, or dakkru [in which case Atheism should be taken out of the settings].
Just from personal observations from other such things: It seems at times the settings team/devs/Talad want to be able to control everyone's actions to the point where certain things like being able to question one's own reality and life cannot be asked. Personally, going with this further, I believe that it would be acceptable for a large group of players to create their own government and country outside the octarchy if they desire, just like how real countries were formed, however this was shot down on a couple accounts from what I hear.