The Vatican announced today that in its latest studies Muslims now outnumber Catholics as the world's largest denomination (Reuters story here.) Muslims made up 19.2 percent of the world's population and Catholics, 17.4 percent. The Vatican ascribed this to the higher birth rate among Muslims than Catholics.
Muslims are the most anti-education extremists on the planet. As is generally recognized, education of and literacy among women lowers birthrates. Keeping birthrates high is probably why Muslims are against the education of girls, even utilizing violence (as in this story) to keep women from obtaining an education.
Christians as a whole still outnumber Muslims, claiming 33% of the Earth's population.
As the world's fastest-growing religion, Islam represses minorities within Islamic theocracy territories by intimidation and dhimmi laws. Islam is the largest danger to personal freedom for non-theists in the future.