Fulton J. Sheen said this quote

Years ago atheism was an individual phenomenon; today atheism is social, the atheist who once was a curiosity, is now a component part of some of the governments of the world. Once men quarreled because they wanted God worshipped in a certain way; now they quarrel because they do not want God worshipped at all. The wars of religion of the seventeenth century have become the wars against religion of the twentieth century.