The
demographic breakdown between the two denominations is difficult to assess and varies by source, but a good approximation is that greater
than 75 %
of the
world's Muslims are Sunni and 10 — 20 % are Shia, [1][2] with most Shias belonging to the Twelver tradition and the
rest divided between several other groups.
Now, realize that though I talk about the US, most
of the
rest of the developed
world is in worse shape as the
demographic crisis affects pensions and elderly healthcare globally — they had even fewer kids
than in the US, which is close to replacement rate, and so the ratio
of workers to those supported will fall even more
than in the US, setting up many nasty political fights — all the more nasty, because the governments are much more heavily involved already.