I think that the religions in RFC are not balanced enough:
Judaism: in the 600 AD start, Judaism should be more dominant in Russia (Khazaria), the Americas and Eastern Europe, and less in Turkey.
Christianity: Christianity is really overpowered, it should never arrive to Mali, Carthage and Egypt (not in Alexandria in the 600 AD start).
Islam: Islam is so underpowered that only Arabia and Turkey are Muslim, Spain should have a 50\50 odds of being Muslim and france should have a 25\75. Egypt ussualy have Islam in all of their cities but never convert to Islam. Mali is sometimes Muslim but converts to christianity when only one of their cities is Christian. Persia and Babylonia are Muslim only in the 600 AD start.
Buddhism: Should be less dominant in Persia and more in China, Mongolia and Japan.
The Chinese religions and Hinduism: The chinese ones should only be in china, and Hinduism should only be in India.
Judaism: in the 600 AD start, Judaism should be more dominant in Russia (Khazaria), the Americas and Eastern Europe, and less in Turkey.
Christianity: Christianity is really overpowered, it should never arrive to Mali, Carthage and Egypt (not in Alexandria in the 600 AD start).
Islam: Islam is so underpowered that only Arabia and Turkey are Muslim, Spain should have a 50\50 odds of being Muslim and france should have a 25\75. Egypt ussualy have Islam in all of their cities but never convert to Islam. Mali is sometimes Muslim but converts to christianity when only one of their cities is Christian. Persia and Babylonia are Muslim only in the 600 AD start.
Buddhism: Should be less dominant in Persia and more in China, Mongolia and Japan.
The Chinese religions and Hinduism: The chinese ones should only be in china, and Hinduism should only be in India.