Decline of Christianity in the Western world

A decline of Christian affiliation in the Western world has been observed in the decades since the end of World War II (1939–1945). While most countries in the Western world were historically almost exclusively Christian, the post–World War II era has seen developed countries with modern, secular educational facilities shifting towards post-Christian, secular, globalized, multicultural, and multifaith societies.

Source: Wikipedia — Decline of Christianity in the Western world (CC BY-SA 4.0)