From what Toady has said on the topic of Religion, is that it'll play a part when guilds come back.
The dorfs will care more about their family, and their guild and religion. It doesn't seem like for now, that there will be to much difference between guilds and religion. Which, in they hit X number, or have X number in Y population, they'll get together make mandates for rooms, furniture similar to nobles.
Religious dorfs will try to convert one another. They'll get sad thoughts if other dorfs to bad things to their religion center, and if they dont have one after their mandate expires, as well if it gets destroyed during FUN.
And they're been talk about more internal drama, from guild wars and religious rivalries, block wars type things. Possibly actual combat, maybe murder, and vandalism.
Urist mcLutherian marries a Urist mcLatter-day-Saints, they cant attend either church.
Urist McMiner Mining Guild gets really pissy, along with Urist, because hes suddenly a farmer, and the Farmer Guild treats him badly, does mean things to Urist because he a freaken Miner.
Probably more fun things along these lines.
As for Gods interacting with the fort, that is ways ways, just ways off. God interactions wont happen until magic is being considered. And the fabled magic arc is post v1 DF.