It seems that very few religions can survive the departure of the founder. I suppose if Torpius were still around (when the heck did he leave?) AP would be alive, not only because there would be an elder priest, but because he seemed to take the religion roleplay quite seriously. The founder of SA is still around, isn't he? Is there an example of a faith in Dwilight that has survived losing its prophet?
Mathurin disappeared for a good long time (he paused the character I believe), but he announced his intentions ahead of time and it was roleplayed that he was going into religious seclusion. He eventually came back, obviously, but he was out for quite a while, and SA did just fine without him. SA had some serious momentum on its own by that point though.