I love the book of John. I really do. I highly recommend it if you’re just starting to read the Bible for the first time, or the first time in a long time. There is so much great theology packed into it, but you don’t need a graduate degree to understand it. I just read John 1:1-18 and in just those few verses it tackles creation, the deity of Jesus, touches on the concept of the trinity (“The Word was with God, and the Word was God”), his incarnation as well as rejection vs. belief in him.
It’s so meaty and that’s only the first 18 verses. Come of think of it, the gospel of John is kind of like a spiritual steak.
According to one of my Bible study guides (New Testament Life and Times), early Christian Irenaeus wrote that John wrote this gospel to dispel the error that Jesus and God were separate beings (“they say that the Creator was surely one, and the Father of the Lord another…”) which was spread around Corinth and by the Nicolaitans. Rather Jesus, the Father (and the Spirit) are one God in three distinct persons.