These facts are summarized by Friendly Atheist as:
Indeed, while either Christians or Muslims make up the largest religious group in nine-in-ten nations around the globe, “nones” rank second in size in most of the Americas and Europe, as well as in many countries in sub-Saharan Africa.…Of the 112 countries and territories in which the unaffiliated rank second, Christians are the largest religion in 106. In many of these nations, including the U.S. and most of Western Europe, “nones” are a substantial minority.Take a note that in 106 of 112 countries in which Nones are #2, Christians are #1. Yet it is the Christians who repeatedly (and falsely) portray themselves as being persecuted by non-Christians. This phenomenon is explored and debunked as a cultivated myth by Christian adherents in the book The Myth of Persecution: How Early Christians Invented A Story of Martyrdom by University of Notre Dame professor Candida Moss.
Hat/tip to Friendly Atheist