I see what you're saying, but it isn't really black and white, like I'm sure you know. Everything evolves or it dies, and religion is no different. The Mo's are not immune to change, thank goddess, because change is oftentimes a very positive thing.The second point raises another interesting side-topic. Would you want a church that changes with the ebbs and flows of societal meanderings, or do you want one that preaches an unchanging gospel and holds to those principles no matter what?
Of course we should want a religion that ebbs and flows. If not, we'd still be persecuting blacks and sending mercinaries out on crusades.