The philosophy or life stance of 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, and philosophical naturalism while specifically rejecting religious dogma, supernaturalism, pseudoscience, and superstition as the basis of morality and decision making.
The choice between the two religions was given in Genesis 3, with the lie “YOU will be gods, knowing good and evil”.
So, yes, “Humanism” IS Satanism.