Eight years later there doesn't seem to be large scale movement. (in terms of percentage of the population)
Yep, the facts are that mainlines are the ones who are really collapsing
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In fact, Evangelicals are just as religious as they were in 2014, whereas religiosity has dropped among all other large groups. Just check it:
The percentage of Evangelicals who say religion is "very important" in their lives has increased from 79% to 80% between 2014 and 2021, while among the general population the figure dropped from 53% to 41%.
The percentage of Evangelicals who pray every day has stayed stable at exactly 79% between 2014 and 2021, while among the general population it went from 55% to 45%.
Source for figures is Pew Research Center
That correlation means that secular parents rarely have religious children.