A decade ago, Peter Hitchens warned that the atheist campaign to expel Christianity from Western public life would not produce a neutral, secular vacuum—but would instead open the door to something else entirely. In an interview on Conversations, he observed: “When they drive Christianity out of Europe, as they’re rapidly succeeding in doing, they will not create an atheist paradise. They will leave a space for Islam.” His point was not that Islam advances by force of argument alone, but that civilisations cannot remain religiously empty. The attempt to force Christianity from public life—education, law, and government—does not produce neutrality....