Humanism is a philosophical stance that emphasizes the individual and social potential and agency of human beings. It considers human beings as the starting point for serious moral and philosophical inquiry. Humanism is an approach to life-based on reason and our common humanity, recognizing that moral values are properly founded on human nature and experience alone. While atheism is merely the absence of belief, humanism is a positive attitude to the world, centerd on human experience, thought, and hopes.
Hope that helps, Bai