When will the antichrist start to terrorize?

All this crap going on in school about the antichrist. people in cl saying barack obama is in the antichrist. and all of the US military one day will whipe out. First of all I have a cousin that is in the marines, that just worrys me I mean I am not smoking anything I am not on any types of drugs, but one day will the antichrist appear? is he the devil? will jesus save us all?