Why do christians worry about the 'Anti-Christ'?

Ok. So lets say for the sake of argument that the anti-christ is real. Lets also say that he is alive right now and is coming to power. Why would you worry? If the prophesy about the anti-christ is real, doesnt the prophesy also say that jesus will return, beat the anti-christ and save everyone? So, if you already know the good side will win, why worry about it? You might die in the conflict, but you will go to heaven. So why even worry about it? If the anti-christ has no chance of beating god/jesus, why worry?