Cleric and Inquisitors get domains from those granted by deity, and weapon proficiency. Certain spells or feats only available to worshipers of certain deities, from those i used is Erastil's Savior's Arrow.
Other than that, you can pray to your deity in a grave danger, and you will roll natural 20.
Choosing a deity doesn't make a difference for most characters (besides RP) unless you spend some other resources (Traits or Feats) on the option. Exceptions to that include Clerics, Paladins, Inquisitors, Oracles, and possibly other classes I'm not thinking of at the moment.
The main options you can choose to spend resources are on the Divine Obedience feats or religion traits. There are also the prestige classes which modify what the Divine Obedience feats do.
In some very rare occasions it might matter to spells and traps.
I was playing a convention game and I was playing a cleric of Asmodeous. The group ran into a trap which consisted of an archway and some words. There was a wall of force blocking the path, but if you read the words on the arch it would allow you enter.
turns out, the words were an oath pledging yourself to asmodeous. This meant that reading the words had no impact on my character and minimal effect on the assassin in the group.
Unless the gm goes out of their way to make it matter for non divine characters though, it tends to not matter much.
Choosing a deity doesn't make a difference for most characters (besides RP) unless you spend some other resources (Traits or Feats) on the option. Exceptions to that include Clerics, Paladins, Inquisitors, Oracles, and possibly other classes I'm not thinking of at the moment.
The main options you can choose to spend resources are on the Divine Obedience feats or religion traits. There are also the prestige classes which modify what the Divine Obedience feats do.
Oracles don't have any mechanics dependent on worshiping a deity.
Some deities will add spells to the spell lists of certain classes, even if they're not divine casters. For example, Nethys adds Imbue With Spell Ability as a 3rd level Bard spell and as a 4th level Sorcerer/Wizard spell, but he forbids any of his worshipers from using Imbue With Spell Ability or anything similar to it on targets that can't already use some kind of spell or SLA.
Choosing a deity doesn't make a difference for most characters (besides RP) unless you spend some other resources (Traits or Feats) on the option. Exceptions to that include Clerics, Paladins, Inquisitors, Oracles, and possibly other classes I'm not thinking of at the moment.
The main options you can choose to spend resources are on the Divine Obedience feats or religion traits. There are also the prestige classes which modify what the Divine Obedience feats do.
Oracles don't have any mechanics dependent on worshiping a deity.
Some deities will add spells to the spell lists of certain classes, even if they're not divine casters. For example, Nethys adds Imbue With Spell Ability as a 3rd level Bard spell and as a 4th level Sorcerer/Wizard spell, but he forbids any of his worshipers from using Imbue With Spell Ability or anything similar to it on targets that can't already use some kind of spell or SLA.
Eh, sort of true, sort of not true.
Depending on what your Mystery is (which can be granted by a deity) determines what powers you get. Though you are not required to worship them, or even know that they are the ones that grant your power. But I was thinking more generally of what mechanics can be affected by a deity rather than just worship, but I did in fact write worship. So that was my error.