Even though worship of ALL gods is not consistent with settings it is pertinent to this discussion how many do it anyway.
It seems to me that it's actually the most consistent, since the setting is polytheist.
With a pantheon, people tend to pray a god according to their current need. Hunting, they'll pray Xaosia, hurt, Talad, dying, Dakkru, and so on. Priests would be specialised, but it would be rare for other people.
Not praying at all is also fine, because people easily forget about the gods, when it suits them. There are also other reasons.
Personally, I praise mostly Dakkru. Not because of character creation (no idea who I chose back then), but as an acknowledgment of her importance in my life. She's the boon of Yliakum, and the only one whose power we actually experience heavily. And of course, she's not evil, which makes our gratitude sincere.
A few things I find odd in the system:
- the fact that all Dakkru's NPC followers seem to be evil
- the choice at character creation. It need not be there.
-the fact that the magic ways are not clearly related to a deity or another. I don't mean to restrict the Ways according to characters' faith; I'm referring to the fact that, if I understood correctly, all the glyphs originate from the same deity.
- By reading the description of a new character, everybody can see their faith (including the secretive blackflamers)... until the player finds out how to alter his description.
- The lack of clear mythology about the afterlife, which is, after all, the origin of religion and the main concern of believers.