Short answers, pulled from the story.
The Hebrew term śāţān first appears in the Book of Numbers, where an Angel of Yahweh stands on a road as a satan against Balaam. This generic noun meaning accuser or adversary describes human enemies like Hadad the Edomite and Rezon the Syrian.
Justin Martyr became the first recorded individual to identify Satan with the serpent from the Garden of Eden in chapters 45 and 79 of his Dialogue with Trypho during the second century AD. Early Church Fathers like Theophilus and Tertullian followed this identification, linking the devil to the ancient serpent mentioned in Revelation 12:9.
Muslim exegetes disagree on whether Satan is a fallen angel or the leader of evil jinn due to conflicting textual descriptions. Ibn Abbas asserted that Iblis was originally an angel named Azazil created out of fire while Hasan of Basra argued that Iblis was not an angel but rather the origin of Jinn as Adam is of Mankind.
Satan first appeared in Christian artwork during the sixth century within mosaics of the Basilica of Sant'Apollinare Nuovo featuring Christ the Good Sheppard. Depictions became more common in the ninth century, showing cloven hooves, hairy legs, goat tails, pointed ears, flat noses, and horns derived from Pan, a rustic goat-legged fertility god in ancient Greek religion.
Brian Levack estimates around sixty thousand people were executed for witchcraft during the entire span of hysteria ending in the late sixteenth century. This period followed Pope John XXII issuing the papal bull Super illius Specula in 1326 condemning folk divination practices as consultation with Satan.