Well, they do differ of course, except inasmuch as they all require belief in at least one god or entity of equivalent distinction. Basically what I mean is that all sub-genres of religious affiliation are theism. It's sort of like the way atheism is a specialised subset of scepticism.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
