I think atheism (or some sort) will become more and more common as the typical fundamentalist approach to Christianity (that is so widespread) has trouble standing up to certain kinds of scrutiny or intellectual inquiry. The system just starts to fall apart. Now.....the inquiry is good. What could happen in the process is that either one would reject Christianity altogether, or in the process of inquiry discover an entirely new construct for their faith, which does exist. The latter is how it went down for me.
I have seen thousands upon thousands of people leave my own church tradition and, while I don't think they fully grasp what they are leaving, given the information they are provided it makes a great deal of sense. I tell them so, too! In my view it is part of the time we live in and I do expect the trend to continue. Thing is, it is hard to argue against honest inquiry...one just has to be free to do this. One cannot stay in the little box and deal with the big questions of life. I myself live in the midst of a very rich religious tradition, but I had to get rid of the box a long time ago. Fortunately I found that, in my tradition, getting rid of the box was part of the deal!!