Something funny has happened with the religious distribution in my currecnt game:
The year is 1390.
China: Confucian
Spain: no religion (atheist thocracy)
Russia: Jewish
France: no religion
Arabia: Jewish
India: Hindu
Carthage: Jewish
Holy Roman Empire: Christian (but was Muslim until a couple of turns ago)
Vikings: Jewish
Dutch: Jewish
English: Muslim
Turks: Jewish
Mongols: Jewish
Judaism is at 21%, with the next closes religion being Buddhism at 11%.
***
So how did this come about? Well, actually it was relatively straight-forward.
I started a game as the Greeks, with the intention of expanding into Eastern Europe, building lots of early wonders in the Russian flip zone, and then switching to Russian when they spawned. (Which more or less worked as planned, except the only wonders I managed to build for the Russians were the Great Wall in the Ukraine and the Moai Statues in Byzantium, plus a Great Prophet).
But in the process, I also conquered a big chunk of the Middle East (including Jerusalem), and had the idea of screwing over Saladin by building lots of really badly-placed cities in Arabia (i.e. one tile away from the coast and as close together as possible). I also spread Judaism to them, with the result that Saladin adopted Judaism the turn after he spawned and set about spreading it as best he could. It had also spread to all the other classical-era European and African states.
When the Russians spawned, I gifted them all my money (plus a 14 gold-per-turn allowance) and a open borders treaty just before switching civ. (For some reason, they didn't want any of my technologies or cities, even the ones in their flip zone). Helpfully, the Greeks then declared war on my a couple of turns after I switched, thereby making it easy for me to capture Stalingrad and Kazan (which I had built without realizing they weren't in the Russian flip zone).
While I was never intending to play a religious game, I ended up playing that way once I saw how things were going. I've just managed to convert the Mongols, have spread my religion to one of Asoka's cities, and have a squad of missionaries heading east to India and China.
that's nice 
