I don’t know that I would say that we live in a post-christian world, but I do believe that we live in a post-churched world. People outside of churches are in no rush to get inside them, and if anything, people inside them are making their way towards the door. Both of which groups would probably still claim to be spiritual, but losing either the trust or the need for a structured religion.
Personally, I’m ok with that, because I don’t believe that Christianity is nor should be considered a religion. However, I think that once this diaspora is over, people will long to rebuild the walls.