Jerry A. Coyne in Quillette:
These days you can dismiss anything you don’t like by calling it “a religion.” Science, for instance, has been deemed essentially religious, despite the huge difference between a method of finding truth based on empirical verification and one based on unevidenced faith, revelation, authority, and scripture. Atheism, the direct opposite of religion, has also been characterized in this way, though believers who criticize secular worldviews as religious seem unaware of the irony of implying, “See—you’re just as bad as we are!” Even environmentalism has been described as a religion.
The latest false analogy between religious and nonreligious belief systems is John Staddon’s essay “Is Secular Humanism a Religion?” for Quillette. Staddon’s answer is “Yes,” but his reasoning is bizarre. One would think that it should be “Clearly not” for, after all, “secular” means “not religious,” and secular humanism is an areligious philosophy whose goal is to advance human welfare and morality without invoking gods or the supernatural.
Nevertheless, Staddon makes an oddly tendentious argument for the religious character of secular humanism.
More here.