Encyclopedia Galactica: Old Earth Religions
Waves of emigration from humanity’s homeworld have yet to weaken the venerable belief systems developed on its surface. Some have seen a percentage decrease in their numbers when compared to the whole of the population, but still all the major and most of the minor religions spawned on earth are still quite viable.
Christianity (in Catholic, Orthodox, and various Protestant denominations) is practiced by somewhere around 33% of the human population. Islam (Sunni and Shia sects) boasts approximately 30% of humanity as adherents. Hinduism can claim about another 15% of the population. Somewhere between 5 and 10% of the human population follow either Buddhism or Judaism.
