Disappearing of the subject-matter of the sociology of religion? It’s probably still too early. Sure, currently, the exits from the churches reached a new record high. But that does not mean that religion or religiosity is losing, as such, entirely at social relevance. You could even say: on The contrary. The diminishing binding force of the churches means more of the increase in religious diversity within society, which is now more and more from religious and non-religious people, or on the inside is different.
It can be assumed that the Church exits Essentially religious indifference explain. Sure there may be some out of Protest against the current attitude of the churches to religious, cultural or political issues. Most, however because Religion has become, in itself, no matter. This suggests, however, that the large religious communities at some point on something like a hard core, the really Religious melting, in which the content of the faith and the commandments of their community to be anything other than matter.
This raises the question of how the religiously Indifferent and religiously Convinced, finally, relate to each other. The tolerance to each other, or are more and more plump irreconcilable attitudes to each other? See the earlier Religious in the still, or ever more Religious a dangerous minority, and Vice versa, turn this minority into a fundamentalism of faith of an ever more secular majority society?
The Graz sociologist of Religion Franz Höllinger has these issues now being investigated with data from Austria. The “Social Survey Austria” has asked 2018 in a representative study of 1,200 people over 18 to their religious settings. Höllinger, interested mainly with the question of how religious people are actually Religious. His hypotheses according to the sympathies of the Religious would have to apply, actually, the other Religious, also regardless of which religion someone belongs to. Unless he represents a type of religious fundamentalism, then expected Höllinger something like a missionary intolerance of the fundamentalists to all who were not members of the own Faith.