Far More Than Atheism
Secular humanism is nonreligious, but it differs greatly from both atheism and religious humanism.
Secular humanism is thus committed to science and reason as the method of evaluating all truth claims, whether arising in popular belief, scientific theories, or in moral, political, or religious claims. Similarly, secular humanists are sympathetic to skeptical inquiry--that is, the application of rational methods and empirical/experimental testing to all claims to truth. For that reason, too, secular humanists cannot understand why religious humanists so fear to step on the toes of their religious brethren. Similarly, secular humanists are critical of those contemporary skeptics who express trepidation about treading in religious waters. Surely, skeptical epistemology means that there is open season on any and all claims to truth; all are subject to empirical and rational scrutiny. Critical thinking should not be confined to paranormal claims alone, which might be considered safe to criticize. In principle, critical thinking should likewise be applied to religion, politics, economics, and morality.
What is central to humanism, in my view, is the ethical component; namely, humanists believe that:
Ethics is an autonomous field of inquiry, independent of theological claims, amenable to rational scrutiny, testing value judgments by their consequences. Ethical values and judgments are relative to human interests, needs, desires, ends, and values; they are open to objective criticism and evaluation.