Humanism is a non-religious worldview. In general humanists:

• trust to the scientific method when it comes to understanding how the universe works and reject the idea of the supernatural (and are therefore atheists or agnostics).
• make their ethical decisions based on reason, empathy, and a concern for human beings and other sentient animals.
• believe that, in the absence of an afterlife and any discernible purpose to the universe, human beings can act to give their own lives meaning by seeking happiness in this life and helping others to do the same.

Humanists UK are the national charity that represents humanists. They have a quiz that you can use to see how much your beliefs align with humanism.