My (non-Christian) religion also teaches that the world will eventually end, and describes some signs of the end approaching. Still, I doubt that it's going to happen in my lifetime--let alone as soon as four years from now. If I'm wrong about the scheduling, though, there isn't much I can do about it; what's fated to happen is fated to happen.
If you wonder where the 2012 date came from, the Mayans calculated it in ancient times. However, what they predicted wasn't total destruction for Earth or humanity--just worlwide changes on an epic scale. (I learned all this from a documentary on the History Channel.)