The decline of church membership, especially in the last 20 years, has been so sharp it's worth its own visual:
20 years is incredibly fast for a cultural shift like that. But I do think it coincides with a general decline since 2000 of American and specifically young American institutional trust. Trust in the church, trust in the government, trust in media, trust in generalized leadership and authority is really at an all time low and religion/church is especially part of that institutional sect.
I wonder what the alternative is?
That's a very sharp decline, what would the equivalent graph be that's experiencing an uptick? Cosplay? Comic Con?