“Humanism” is one of those words that might mean almost anything, so it now means almost nothing. What, or who, would **not **be called or call themselves a humanist?
I think it would be better to focus on **Secular **Humanism, otherwise the word means any human, or any idea or social movement at all. Yes, humanist once had a meaning (Erasmus, JP II, many others were called humanist) but they would not be considered real humanists today by others who call themselves humanists.
Secular Humanism refers to a well organized movement over the last few decades. It refers to a specific, agnostic view of human “progress” that all people are called to support, based on equality, interchangeability of men/women, reproductive “rights”, and opposition to religious “dogma” (other than their own religious dogmas, which they don’t consider religious or dogmas).
Classic Secular Humanism can be traced to H. G. Wells, George Bernard Shaw, Bertrand Russell, etc, and was initially more committed to socialism than it is today; today they are obsessed with getting rid of the Natural Law. Compare the Humanist Manifesto I from the 1930s to Manifesto II from the 1970s. I think the best analyses of this movement includes C. S. Lewis’ “That Hideous Strength” and “The Abolition of Man”, and “What is Secular Humanism?” by James Hitchcock. The subtitle on that last book says it all: “Why Humanism became secular and how it is changing our world”.