I think the younger generations are less and less functionally religious or believers. Maybe I am wrong about that, but that's my take, anyway. I suppose it could all get rolled back if all those Christo-Fascists--"American Taliban"--get their way, but that will be eventually be overcome by rationality, science and cooperation. If nothing else, Nature will force the issue as it is already doing.
I don't know. I'm not willing to make that statement. When I was growing up, I had the same idea. But it turns out I was just alike to many of my friends.
In my job these days however, I find that lots of people, even the younger ones, claim to be religious. Relatively lots of strict christians and muslims in the impoverished, low-educated and opportunity-deprived layers of society, to my experience. And I don't think religion and poverty (of opportunity) are unrelated.
Which begs the question; how this is growing on a global scale? Say half of Belgium, a relatively rich country, becomes atheist. That's still only about 5.5 milion people. You can't call that a dent in the world population, not with the best of arguments. The Western World is only a relatively small part of the entire world. And it's the richer layer, if we extend my national example. How's the rest of the world fairing? India? Africa? South America? With the encreasing gap between the rich and the poor globally (as well as in our own country), and the poor education on global level, I don't think we'll see atheism as the norm world-wide for quite some time. At best.
Then again, that's my experience. I too may be wrong here.