Vladimir I is said to have opted for Christianity over Islam based partly on the fact that Islam prohibited consumption of alcohol. In reality, how close was this decision and what factors influenced it as a whole?
While there is almost always more to say on a topic, I've written on the topic of the Christianization of the Kievan Rus before here (by me, /u/superplaner, I see you automoderator). If you have follow-up questions, feel free to hit me up.