I don't think that people cease to attend Church Services because for a lack of faith in God, though for many that may be the case, but for a lack of connection to an imponderable institution that is far more regulatory than welcoming.

As a student of theology, I understand and appreciate where the regulations come from, but for most people they are an incomprehensible burden that support more woe than weal.

Our forebears forsook the municipal and imperial cult of classical antiquity because the Gospel called them to a life-giving connection to God and neighbor.  Perhaps the contemporary institution is just no longer capable of issuing that invitation.