1.profane or contemptuous speech, writing, or action concerning God or anything held as divineYesterday's blasphemy explored the idea that Atheism was not all that awesome and that even the most ardent Atheist (Christopher Hitchens) can't guarantee that he will always be an Atheist. Although Atheism and Mr. Hitchens are not divine many people revere them. There is often a sense of emotional attachment that can have similarities with that of a worshipper to their god (I think I may have blasphemed again). A Beginner's Guide to Skeptical Dickery is blasphemous in the same vein. Here, Dr. Burnett satirizes (blasphemes against) the sceptic community. Looking at the comments from readers supports the theory that satire is hard to pull off and even the smartest of individuals will simply not get the joke.
2.any remark or action held to be irreverent or disrespectful
I think Dr. Burnett has done a great job.