Apostasy Declining Christianity: Is America Finally Falling Away From Jesus?
3 Reasons: Explaining why this sudden slump has occurred, Grid states: "There are 3 main answers to that question: the Cold War, 9/11 and the internet." These 'nonverts' include both unbelievers & religious unaffiliated choosing not to join any group. Bullivant claims there are as many different reasons as there are people who've dropped out of religion. But obviously the big motive for abandoning traditional faith has similar reasoning. But this trend is not set in stone.
Mainline Massacre: Has the American church lost its way? Apparently, the old mainline sects lost it long ago. Other, newer churches stepped away from a literal theology to try more user-friendly approaches. Some of these go "Woke" and apply the latest trends as their theology.
Woke Faith: Churches which strive to adapt to current social norms, such as CRT race theory and Global Warming, are losing members, like mainline Presbyterians & Anglicans. Both have been hemorrhaging members for decades and will collapse in a few more years, most likely:
See Politicized Presbyterian Church (USA) Falls Further, April 22, 2022:
"The Presbyterian Church (USA) released annual statistics showing a decline in membership in 2021 of 51,584 persons, a 4.1% rate of decline & total membership of 1.19 million members last year, compared to 1.48 million in 2016. The total number of churches is 8,813, a total of 112 fewer than in 2020. This is consistent with a precipitous and uninterrupted decline that intensified when the denomination revoked a "fidelity and chastity" clause from ordination vows that had required clergy to remain faithful in married life or chaste in single life. The General Assembly also enacted policies uniquely critical of the state of Israel and embraced a host of politically charged causes."