2012 doomsday.

[CL0V3R]

It's not a religion if it has no deity. So technically it can't be branched from Satanism if it isn't following its deity. It is a philosophy.

That's a moot point and has nothing to do with what were talking about but alright.
He said he was a satanist and I asked him what type. It's still defined as a religion.
re·li·gion
noun /riˈlijən/ 
religions, plural

The belief in and worship of a superhuman controlling power, esp. a personal God or gods
- ideas about the relationship between science and religion

Details of belief as taught or discussed
- when the school first opened they taught only religion, Italian, and mathematics

A particular system of faith and worship
- the world's great religions

A pursuit or interest to which someone ascribes supreme importance

[Google]

Question (Q): Are there any threats to the Earth in 2012? Many Internet websites say the world will end in December 2012.
Answer (A): Nothing bad will happen to the Earth in 2012. Our planet has been getting along just fine for more than 4 billion years, and credible scientists worldwide know of no threat associated with 2012.
NASA - 2012: Beginning of the End or Why the World Won't End?

The only source I would believe...