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What will "religion" look like in the next 100-300 years?
This comes up in the new Edge discussion between Yuval Noah Harari and Daniel Kahneman;
http://edge.org/conversation/yuval_noah_harari-daniel_kahneman-death-is-optional
The film Prometheus, for example, intrigued me by showing a single woman, an archaeologist character named Elizabeth Shaw (played by the Swedish actress Noomi Rapace), who wears a cross and professes her christian faith at a time when christianity has gone into decline, so that christian believers have become relatively uncommon. Yet she sleeps with a man on the space ship, showing that she practices a liberal morality by traditional christian standards. Does this show where "christianity" could go during its long twilight in the "Jesus who?" age?
BTW, I like tweaking unsophisticated christians who believe in this "end times" nonsense by saying, hey, I believe in the rapture, too: I can see that christians have already started to disappear.
The religious mainline cultural institutions are simply too wealthy to disappear in 300 years, especially if they don't pay taxes. I would assume that they will simply adapt with the times as they always have. I could see world where people consider Islam or Catholicism like we see the Amish today, as outsiders.