I have just seen a photo of a "my cat is an atheist" T-shirt on Facebook, taken at the atheist convention in Melbourne. I commented that one of my cats is a pantherist, the other is a worshipper of Ceiling Cat (well she spends a lot of time lying on the floor staring at the ceiling). She also liked to sit on the back of my broom - I think she was hoping it would fly.
So, I give you: religion for cats.
Pantherism: the belief that the ideal state is to be a panther or other large predatory cat.
Pollytheism: the worship of parrots as sacred food.
Minnowtheism: the worship of fish as sacred food.
Belief in Ceiling Cat: Transcendent monotheism.
Belief in Basement Cat: the feline equivalent of satanism.
Hedonism: the natural default religion of all cats.
Cat-o-lick: belief that cats are deities and should be worshipped.