In 50 years time, the world's religious makeup is going to see some pretty massive changes.
According to a new report by the Pew Research Center, Christianity is likely to be practised by pretty much exactly the same share of the world population, while Islam is on an upward path — and by 2050, the two religions will be pretty much equal in size.
Christian and Hinduism are expected to keep up with the pace of global population growth (so keeping roughly the same portion of the world's total), but Islam is expected to outstrip that considerably — Pew is forecasting a 73% increase in the number of Muslims around the world, against a 35% increase in the global population.