Well the ‘snake’ has always been around, it never went away (Revelation 12:9), so we can only assume that God had planned to use the snake for the glory of human kind, to choose to be with him or against him (Matthew 12:30), and the same choice remains today for us. Adam and Eve realized they were naked after they had sinned, and this represents the innocence that was lost, and the following dialogue I believe personally was God trying to reconcile humanity to himself, but no one was repenting, and we had Adam blame Eve and Eve blamed the serpent, and so they were cast out of paradise. This is still exactly what happens today, when we do not accept responsibility for our sins, and do not repent, then confess to almighty God, we are cast out of paradise. We can see in Genesis 3:21 God clothes Adam and Eve, and we can say the same for all of humanity, that we are all clothed by God, but now for us to enter into paradise again, we must wash our clothes with the blood of the lamb. Revelation 22:14 “Blessed are they that wash their robes in the blood of the Lamb: that they may have a right to the tree of life, and may enter in by the gates into the city.”(Douay-Rheims)
I also wanted to mention since I saw someone else mention the killing of the firstborns, that the 10 plagues were very symbolic in terms of the God of Israel being superior to all the Egyptian gods, as each plague represented a specific Egyptian god, and the last plague (killing of the firstborn) was a challenge to all the Egyptian gods.