In Gods we trust - all others pay cash

We have gods the same way as we have bacteria. There are billions of them. They live from belief, without belief, they die. Gods are clearly created by their believers, just take a look at the lives of those gods. It doesn't exactly seem divine the way they pop into existence (especially, if it comes down to beautiful maidens, golden rain showers, nymphs and bulls with extraordinary huge organs...). Gods and humans seem to be inseparable. What gods crave is belief, what humans want is something to belief in.

Each people worship their own gods, some belief in only one others believe that there's a god in every single stone and plant that surrounds us. Some people even adopted ALL of the existing gods and pressed them into a narrow system of belief where they state all gods are one god and all goddesses are one goddess. There and then it makes one wonder if those people keep a list of every newly discovered/created god and try their best to fit it in their system. For workings with gods, try to get some information about them first, like the old myths.

Demons seem to have existed at least as long as the gods. Well, the gods DO need something to fight against, and humans DO need someone to blame him for various on-goings. Some demons can and are also be considered as gods. The difference is basically the same as that between terrorists and freedom-fighters. Considering what most gods seemingly love to do (smiting people, turning people in something entirely else, starting wars etc), it is generally very difficult to part gods from demons. Good sources for working with demons are most of the old grimoires like the "Lesser Key of Salomon" or "The Grimoire Armadel". Demons usually have sigil with which you can summon them.

Spirits come generally in two groups. First there are the spirits of nature, like nymphs, salamander, boreas etc. Then there is the group of spirits of the deceased (that is if you generally adapt that paradigm to work with them - if you don't believe in life after death in some sort of meaning, I doubt you'd get much results). For natural spirits, I'd suggest using the tattwas and it's representative element to summon them.

Chaos mages believe that entities, be it gods, spirits or demons are part of us. We conjure them not from some space beyond or ethereal void, we summon them from within us. Those summoned entities are aspects of us, that are evoked to enhance what we want. Some beings can be considered as servitors gone wild. Servitors that managed to get too much believe together for their own good. A good example herefor would be the Christian/Jewish god.

Gods

A list of the more important gods of the following pantheons: