I see; in that case the irrelevance of the Church to that age group alone could explain the drop.
The only people still having 3 or more near me are civil servants (due to the assumption of lifetime unemployment without competition) and immigrants (legal & illegal).
Ah, New Jersey! We get a lot of people from up there, mainly in their 50s and up. They mellow out when they see how peaceful and cheap it is here in the bland mid-South suburbs.