Christian tradition generally views Satan as a fallen angel who rebelled against God and was expelled from heaven.

In Christian theology, Satan is often seen as a once-exalted angel who became proud and sought to equal God. His rebellion led to his expulsion from heaven along with other angels who followed him. This narrative is supported by interpretations of scriptures such as Isaiah 14 and Ezekiel 28, and by New Testament references like Luke 10:18. Over time, Satan became the embodiment of evil, the tempter, and adversary of God's followers.