I wanted to like this book more than I did. But Damian Thompson was not a particularly appealing advocate for the forces of reason. His tone throughout is one of self-righteous superiority, with the result that after a couple of chapters, it's like being trapped at a dinner party with a know-it-all guest - you don't care how right he is - you just wish he'd shut up already.
Not that his targets aren't worthy. They fall into three main categories: pseudoscience, pseudohistory, and what might be thought of as examples of "popular delusions and the madness of crowds". Thompson gives particular scrutiny to:
# Creation "science" , "intelligent design" and the assorted shenanigans of evolution-bashers.
# The prevalence of untested, unproven "alternative therapies" (which he refers to as "Quack remedies"), from homeopathy to reflexology to aromatherapy.
# Assorted conspiracy theories (primarily related to 9/11)
# Examples of "pseudohistory": Jesus's lovechild survives, but the Catholic Church maintains a conspiracy of silence. The Phoenicians/Israelites/Celts/Greeks/Vikings/Chinese discovered America in (choose your pre-Columbus date). Aliens (or technologically super-savvy ancient civilizations) roamed the earth, building the pyramids and Mayan temples until perishing in the lost city of Atlantis!
# Marketing phenomena such as "The Secret", dubious dietary supplements, QLink bracelets with crystal-based 'healing powers'.
All of this makes Thompson righteously indignant. And I'm certainly not going to defend any of them here - indeed, all this bogus 'knowledge', shoddy scholarship, and fuzzy thinking does deserve our skepticism, at times our condemnation. But from a purely pragmatic point of view, Thompson would be more persuasive if he didn't wax quite so white-hot indignant about each and every example he cites. After all, not every example of 'counterknowledge' has equally serious consequences - some are considerably more damaging than others. Bogus science which denies the link between HIV and AIDS, or which makes unwarranted claims about a putative link between MMR vaccination and autism is clearly actively dangerous, as it can cause people to avoid therapies proven to be beneficial. Those who promulgate this kind of misinformation, in the service of their own political or profit-driven agenda, deserve to be challenged and possibly earn our moral censure. But no matter how much the success of Rhonda Byrne's "The Secret" or Gavin Menzies's "1421: The Year China Discovered America" might irritate Thompson (and clearly, it does!), it is hard to see these books as being quite as dangerous or reprehensible as,say, holocaust denial used to foment anti-Semitism or the South African government's distortion of information related to the cause of AIDS.
Thompson's uncalibrated indignation has the unfortunate side-effect of suggesting that every instance of 'counterknowledge' deserves equal condemnation, which ultimately hurts his argument, though not fatally. A far more serious flaw throughout the book is what I can only term a persistent anti-Islamic strain, which is hard to ignore, and seems particularly unfortunate given the author's position as editor-in-chief of The Catholic Herald .
For instance, Thompson claims that "Islamic Creationism is turning into a serious problem for British sixth-form colleges and universities", but fails to substantiate this claim with anything but the flimsiest of anecdotal evidence. He goes on to assert that the damage of Creation Science is limited within the United States because it is still "essentially located within the American cultic milieu", while "Islamic creationism" by contrast is a unified and increasingly influential component of a wider Islamic worldview". Which might be OK if he didn't then go on to establish that almost all of the anti-Darwinist propaganda promulgated in the name of Islam is the product of a single individual. In these sections Thompson appears clearly guilty of applying differential standards of evidence to support his claims.
In the end, the most useful part of this book was the "Further Reading" section that concludes it.