Lets see if you like this.
Note this goes together with what IronJelly and I said.
You start with no religion unless you are a priest.
Next step is to find a temple of the god alignment you are going to chose (FE; Death, War, Chaos, Nature, Magic...)
So, each Alignment has around 4 gods, maybe 1 more.
You worship ALL of them.
Each god has a different personality.
Having a good and balanced relation with all of them provides some extra bonuses, and maybe (only maybe) luck.
To take thier attention you must Pray and them choose to what god.
You can only Sacrifice and Offer (or doing things that make the god happier) if you have prayed a few turns before, otherwise, he will not notice unless you have a very high level of relation ship with that god (he will be paying attention 90% of the time).
You cant be the champion of an only god, you must be a champion of the whole alignment, so to become a champion of death, you must have a very high relation with your god, as well as being a powerful necromancer (i readed somewhere that classes will only affect the initial values of the skills, equipament and stats (so a necromancer with a lot of practice can master archery, and a archer learn how to ignite their arrows in air))
Crossworshipping exist; This means, that if you have a high relationship with death god, chaos only will know a like you too, and will love if you switch to their alignment, and totally the opposite with Order gods.