Humanists believe that this life is the only life we have. In order to lead a rich, meaningful life we must live ethically with each other and make decisions based on reasoned thought.
Humanism and atheism/agnosticism are linked in that Humanists, atheists, and agnostics do not believe in gods or goddesses. Humanists start from there and say that we believe that we must live ethical lives, that reality is knowable and that the universe works on natural processes.
~ International Humanist and Ethical Union’s Minimum Statement on Humanism