beliefnet
I’ve seen the term “secular” used interchangeably with the terms “secular humanism” and “humanism”.*sarcasm* I have seen religious used interchangeably with Christian bigots, Televangelists, Bob Jones University and many other manifestations of spirituality. So it is OK for me to say religious means Christian bigot? */sarcasm*
"Secular" has a well-defined and limited meaning as explained above, and may not involve humanism at all. Communism and Fascism and Capitalism are secular and not humanist by any stretch of the definition of humanist. "Secular Humanism" is a well-defined organized society not to be confused with "secular humanism" which is a worldview based on the rejection of supernatural influences over human behavior and generally promoting a human centered social philosophy. "humanism" may or may not involve God, god or gods, but is again a human centered social philosophy.
Many of my social mentors have been theistic humanists. Indeed the only Christian churches I respect and enjoy visiting are humanist in the sense that they essentially reduce the message of Jesus to the Two Great Commandments. Note that the First involves God and I have no problem with that. I might argue that they are not Christian, but that is another definitional blivot.