Hello and welcome!
Extenuating Circumstances is a Pathfinder d20 fantasy campaign, starting at 2nd level. There is no restrictions currently based on characters, though everything is subject to GM’s approval prior to inclusion.
The world this is taking place on is simply the Prime Material Plane, with the standard transitive and other planes know from both D&D and Pathfinder. Please refer to the standard list of 3.5 D&D deities for normal divines, though your character is welcome to pray to who/whatever your character wants.