Why do you try to convince people not to believe?

Even if there is no God why try to convince others? I mean there is no Santa do you go around telling that to little kids? The point is that God offers life, and you offer hopelessness. So will you spread hopelessness throughtout the world? Or will you teach people moral values,respect, love, righteousness. Will you tell others we are nothing but evolved apes? I wonder if no one believed in God what would the world be like? Governments would think of population control, war, genocide of the elderly and disabled. Atheists would have you believe that all the terror in the world is because of religion. Well perhaps they forgot about Hitler and countless others before him. Sure religion is used as propaganda but that doesn't mean religion it self is evil. I just want to say im going to spread hope and good. What do you think