Religion, in the traditional sense, is dying. Dogmatic, unchanging belief in a certain set of ultimatums is dying. It's unfit for our faster than ever changing lives and this age of constant new discoveries overtaking old ones. Developments in communications has made this happen faster, because people can now communicate with all kinds of other people, understand new perspectives, and become more empathetic towards people of different backgrounds instead of the tribal hive mind mentality that traditionally religion imposed. It's not that we are no longer belonging to groups, because the need to belong is coded into our genes, but rather our groups are becoming larger and more inclusive as we communicate better. I personally find that any group mentality, no matter how advanced and inclusive, could still lead to problems (political correctness being a prime example), but lets not jump to other subjects.
Spirituality and super natural belief aren't fading as much as traditional religion is, since there are many things that we are yet to be able to explain properly (in fact the more we learn the more we realize how much we don't know) and people find comfort and motivation in believing that there might a deeper meaning to it all. You never know really.
I read this article that it is almost a biological need for people to have some sort of belief in something, whether it's traditional religion, spirituality, or simply filling that void with philosophy and art. I find it highly unlikely that all of these will ever collectively fade away, maybe just traditional religion due to the hindrances it imposes.