Religions exist for reasons,
they're probably not the reasons you'd guess in 5 minutes with smug self-confidence and a half baked polisci degree,
figure out what the reasons are and then you don't need religions.
It's an ongoing process but secularization seems to be faster than the people actually picking religiosity apart and you can tell by societal growing pains; while criminality is going down with open enforcement and raw qol is improving from capitalist surplus, recent generations have complained of persistent unhappiness and mental degradation that wouldn't make sense from a purely material perspective- you'll see things like
this fight to pin it on a bunch of seemingly reasonable explanations that are everything
but a core pillar of modern society being ripped out at the roots, and that should probably be the first place to look.
A common argument involves 'naturally atheistic societies' in the east but an even slightly closer look reveals great parallels in these issues there, it's just that the populace is utterly apathetic to them as 'problems'; they often also have a rigorous superstitious structure or strong religious undertones in how they structure their immediate surroundings, the Chinese especially. It's also worth noting that the more secular societies tend to have been that way for centuries and there might be reasons for that, too.
There was a really great quote from someone or another talking about how they were ostensibly religious because it meant their neighbors - who might be taking it seriously - would be more polite, strangers - much the same - would be less likely to rob him, and his wife - curiously still a true believer - would be less likely to cheat on him. I couldn't find it, but these things do
seem to be
true on some level.