It is true that there's been a leveling off of the Nones and a less steep decline in religiosity (mathematically, this would have to be the case, because there was a HUGE break about 20 years ago and imho it was mostly due to people being comfortable enough to publically voice non-belief and a relatively safe place to say it - the internet. And something like that can't really grow year-over-year like a tiny new religious movement, where low numbers pretty much guarantees high growth rates)
It is also true that gen Z is overall less religious than millennials, who are in turn less religious than gen X and boomers.
And looking around at religion in America - where megachurches have gobbled up smaller churches and there's this odd corporatization of religion as well as the ever-present collusion of church with far-reich state, it's not exactly a very enticing thing for someone who might be on the fence.
Case in point:
While I don't expect America's very peculiar religiosity to die out anytime soon, it's less and less the norm.
The more you know about your religion the less likely you are to believe it. Time will tell.