If 3 is true, then we're all buggered. The Christians think that the Muslims and Jews are doomed to hell. The Muslims think that Allah will judge the Christians and Jews and the Jews God is one of fire and brimstone.
So - if your not Christian, Muslim or Jewish your screwed. And even if you are one of those religions, the others God won't like you, so
you're subsequently screwed.
In the schism times (late 1300's) there were two popes. Each one excommunicated the followers of the other. People believed that this resulted in
everything from demons to vampires and everything in between. It was a mess. Just like now.