I don't understand what exactly Secular Humanism is

[Something completely different]

We are lucky enought to live in an era in which information and knowlege is as freely available as ever before:

http://en.wikipedia.org/wiki/Secular_humanism

The philosophy or life stance secular humanism (alternatively known by some adherents as Humanism, specifically with a capital H to distinguish it from other forms of humanism) embraces human reason, ethics, social justice and philosophical naturalism, whilst specifically rejecting religious dogma, supernaturalism, pseudoscience or superstition as the basis of morality and decision making.

Use that opertunity