Making choices is hard! Particularly when there are multiple possibilities, differing in multiple dimensions. Like choosing the best religion.
There are many possible methods, leading to a variety of outcomes. The 18th century French mathematician Marie Jean Antoine Nicolas Caritat, the Marquis de Condorcet, advocated privileging methods of deciding elections that will always grant victory to a candidate who would win one-on-one against each other candidate individually. (Of course, there need not be such a candidate.) Such methods are referred to as “Condorcet methods”.
I’ve just been reading The Jews of Khazaria, about the seventh to tenth-century kingdom in central Asia that converted to Judaism around the middle of the ninth century.
According to the Reply of King Joseph to Hasdai ibn Shaprut, one of the few surviving contemporaneous texts to describe the internal workings of the Khazar kingdom,
Each of the three theological leaders tried to explain the benefits of his own system of belief to King Bulan. There were significant disagreements between the debaters, so Bulan went a step farther by asking the Christian and Muslim representatives which of the other two religions they believed to be superior. The Christian priest preferred Judaism over Islam, and likewise the Muslim mullah preferred Judaism over Christianity. Bulan therefore saw that Judaism was the root of the other two major monotheistic religions and adopted it for himself and his people.