Which is the best correlation between the introduction of islam and an increase in literacy?

The best correlation between the introduction of Islam and an increase in literacy was the people needed to know how to read in order to be devout practitioners of Islam.

it depends on which society you are referring to. many civilization performed rituals so the gods would with their growing season but the most well known is that of the aztecs. they would make sacrifices, usually animals, but sometimes humans as well.