Is it just a coincidence Indians, Muslims, Scientists and Christians think the end is Dec 2012?

You know as a Sikh I have to respect all religions, but when crap such as the Antichrist and 2012 come up I laugh my head off. As a Sikh I believe the big bang created the universe, that evolution is how we came into existence and that our universe is beyond our understanding. Yet somehow Muslims and Christians calls us the liars and say we are a cult.