Thesis Secular humanism needs no metaphysics, and that is its strength
Where it stands
I'm an atheist, and I call myself a humanist in the modern sense: ethics and meaning without religion.
I keep being told that humanism is just another religion, a faith in Man with its own unprovable dogmas. I want to argue the opposite. Secular humanism is strong precisely because it needs so little. It asks you to accept that human beings can suffer and flourish, that we can find out about the world by reason and evidence, and that we owe each other consideration. You can hold that with almost any metaphysics, or with none. It doesn't need a theory of the soul, or of the ultimate nature of reality, or of why there is something rather than nothing.
India has old precedent. The Cārvākas, whatever their opponents made of them, rejected the authority of scripture and the existence of a world beyond this one, and insisted on what can be perceived. They were given a poor hearing by people who mostly quoted them in order to refute them.
I should be clear which "humanism" I mean, since the word has at least four senses. I don't mean the Renaissance curriculum, and I don't mean anthropocentrism in environmental ethics. I mean the modern worldview. My thesis: it is the minimal common ground on which people of all faiths and none can build, not a rival faith.