In a current multiplayer game, it surprised me to no end, but Isabella NEVER got a religion on her own. AI Montezuma got Buddhism, Catherine(Human) got Judaism, AI Huayna Capac got Hinduism and Islam. I got Christianity. Don't know who got Confuc and Tao, but she didnt. Since she and I share a continent I sent my Christian Missionary to her, it spread to the other Human in the game, and now we have a very powerful bloc. The Other Human just decided to crush Tokugawa and by himself is the most powerful civ at the moment.