This chapter on the development of US and German Catholicism in the second half of the twentieth century till 2015 traces two paths of religious modernization. The legacy of the religious subcultures of the nineteenth century in both nations was quite similar. However, after 1945 the Catholics followed different tracks, which are often interpreted as ‘secularization’ versus ‘exceptional’ booming religious life. More detailed data show that this argument is quite short-sighted: both Catholic Churches adjusted in the first place to the different developments of the nations of which they are a part (church–state relations, welfare state, culture, etc.), although, since the millennium, a deep (generational?) crisis of membership on both sides of the Atlantic can be identified. So from this argument it can be concluded that the USA is not a religious nation that is separate from the rest of the world.