"The upshot is that the population rate of the religious unaffiliated is at least leveling off and may be contracting."
The Decline of Religion May Be Slowing Religious “Nones” moved down slightly in 2019 & Gen Z is no less religious than millennials across several datasets
This is not to say things won't change. And there is some evidence that the growth of the "nones" is slowing, but for now we're still seeing a continued rise in nonreligious identity.