Having delved further, I realize that the question is really asking about something worse that has developed as a result of the aforementioned. Today, people aren’t just shirking god-ordained affiliation, they’re rejecting traditional religious affiliation altogether for substitutes of man-made ethics and politically correct morality. They do affiliate, just not with anything related to their Creator. They’re trying to fill their internal, god-shaped vacuums with church-like accouterments (e.g. hymns, creeds, sermons, offerings, doctrine, etc) while deliberately excluding the divine Savior. Hello, Anti-church!
Church isn’t just for the “unaffiliated,” it’s also for those with whom they fail to affiliate. God says that we must “not give up meeting together, as some are in the habit of doing, but . . .encourage one another” (Hebrews 10:25 New International Version). So, if people don’t start seeing themselves as indispensable contributors rather than persnickety consumers, the un-affiliation will grow until there will be nothing left from which to un-affiliate, and God help us, but then I don’t think He will. Now is the time to invest in eternity, by aggressively reaching these unbelievers in our midst before it’s Babel all over again.