Meh, it just means the people who are religious are defining their religiosity differently from previous generations, which is not that rare a thing. The phrasing in the graph is odd since the article says people believe in an afterlife, not necessarily Heaven which implies a more valued answer.
The smart ass tone of the article is really annoying though. Like he's got it all figure out and fuck these kids and their newfangled ways of wearing their trousers.