By watching YouTube, reading the news or a history book.
There are people, like Pastor Greg Locke, who want the death penalty for homosexuality, the medieval and Renaissance churches who extracted the morality of crusades and witch burnings from the Bible, the RCC, who in the 21st c still justifies gender discrimination.
I don't think that a book, that is so ambiguous about morality that it can justify the Spanish Inquisition, is useful for teaching morality.
Btw.: you didn't answer the first question.