The author, David Carlin, begins this book with a distinction between homosexuality (same-sex attraction or behavior) and homosexualism (the ideology of the gay movement). He says that homosexuality is no danger to Catholicism, but that the ideology of homosexualism is a very grave danger. Moreover, homosexualism is part and parcel of an even larger philosophical danger, which Carlin calls moral liberalism, according to which we are free to do anything...