Switzerland has seen a similar rise of the unaffiliated and it never suffered mass casualties from the World Wars: https://en.wikipedia.org/wiki/Religion_in_Sw

Switzerland has seen a similar rise of the unaffiliated and it never suffered mass casualties from the World Wars: https://en.wikipedia.org/wiki/Religion_in_Switzerland#Census_data https://en.wikipedia.org/wiki/Religion_in_Switzerland#Census... If it's 80% retention per generation, there's no fatherless-blip needed to explain the decline since WW II. 0.8 * 0.8 * 0.8 = 51.2% retention after three generations.