Ask a Secular Humanist!

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Secular Humanism (note the capitalization) is a specific brand of humanism. It would make no sense for a theist to self-label as a Secular Humanist because that brand of humanism specifically eschews gods. That is not necessarily the case with other brands of humanism or humanism in general.

Wiki: Humanism is compatible with atheism[/url] and agnosticism,but being atheist or agnostic does not automatically make one a humanist. Nevertheless, humanism is diametrically opposed to state atheism. According to Paul Kurtz, considered by some to be the founder of the American secular humanist movement, one of the differences between Marxist–Leninist atheists and humanists is the latter's commitment to "human freedom and democracy" while stating that the militant atheism of the Soviet Union consistently violated basic human rights. Kurtz also stated that the "defense of religious liberty is as precious to the humanist as are the rights of the believers". Greg M. Epstein states that, "modern, organized Humanism began, in the minds of its founders, as nothing more nor less than a religion without a God".