re: Humanism?
While I know many "secular humanists" who are fine people--in fact all of them I know personally are--and have strong individual codes of behavior, there are too many who seem to equate that term with "anything goes."
As with other terms, maybe it needs to be narrowed down a little.
There are many examples of conventional religion being harnessed to evil purposes, but simply discarding it without a consistent set of rational principles to replace it with leaves too many people open to worshiping other things, often with equally evil results.
Replacing the Opiate of the People with the Methamphetamine of the People is never a good idea.