I found this weekly address from the Pope interesting
The serpent is a symbol of sin. The serpent that kills but also a serpent that saves. And this is the Mystery of Christ. Paul, when speaking about this mystery, said the Jesus emptied himself, humiliated himself and destroyed himself in order to save us. And (whats) even stronger, he became sin. Using this symbol, he became a serpent. This is the prophetic message of todays reading. The Son of Man, who like a serpent, became sin, is raised up to save us.
Pope Francis went on to explain that this is the story of our redemption, this is the story of Gods love. If we want to know Gods love, let us look at the Cross, a man tortured a God, emptied of his divinity, dirtied by sin. But at the same time, he concluded, a God who through his self-annihilation, defeats forever the true name of evil, that Revelation calls 'the ancient serpent.'
God sacrificing himself to himself to defeat evil. Basic, core beliefs of pretty much every religion (maybe not the weird sarificing himself to him self to save us from himself bit, but the good triumphing over evil bit)
Just to post a non-devisive article straight from the Pope's mouth.
http://en.radiovaticana.va/news/2016/03/15/pope__jesus_annihilates_himself,_defeats_the_evil_serpent/1215503