Some atheists are
fascists, and fascists cannot be humanists. Some atheists are
nihilists, and nihilists cannot be humanists. Some atheists are
Stalinists, and Stalinists cannot be humanists. This is quite obvious because those idealogies clearly contradict the values of
humanism. And there are
Buddhist humanists and even
Christian humanists. Our Nation's Founding Fathers were in fact Deists and Humanists themselves. There are humanists of all kinds, as there are atheists of all kinds. This may come to as a shock to you, but there are a myrad of different religions and philosophies out there, most of which are
not mutually exclusive from one another. Research is our friend. Don't be shy, try it out sometime.
You're welcome, son.