“I'm having a hard time balancing out all these scriptures with the father son and Holy Ghost. Some of these scriptures clash with the Trinity doctrine. After I looked into the Trinity doctrine and looked into that last verse I saw a clear contradiction. The Trinity doctrine says that God the father isn't greater than God the son but they have the same roles but Jesus said my father is greater than I.
So it sounds like we have two options:
1. Either we can try to interpret what Jesus said to make it fit with the Trinity doctrine.
2. Can we reject what came out of Jesus' mouth?”
John 14:28 said“You heard that I said to you, ‘I am going away, and I am coming to you.’ If you loved Me, you would have rejoiced because I am going to the Father, for the Father is greater than I.
John 14:28 is not speaking strictly of divinity. It is speaking about the incarnation of Jesus in which the human nature was added to the Son’s divine nature. (This is called the hypostatic union.) Jesus, the human aspect of the Son, was “under the [mosaic] law” and as such, he identified the Father as being greater than him. Which from a legal aspect is 100% accurate. It also means that this is not the contradiction it was thought to be.
The verse below speaks of this:
Hebrews 2:9 saidBut we do see Him who was made for a little while lower than the angels, namely, Jesus, because of His suffering death crowned with glory and honor, so that by the grace of God He might taste death for everyone.
It is not possible for a mere human to bear the sins of the world. Only divinity could possibly accomplish such a task. Furthermore, only a human can serve as our replacement for the payment of sins. This is where the hypostatic union comes in and why it is vital to our salvation. Just as without the resurrection and because God is both just and merciful, without the hypostatic union there is no Christianity and you are dead in your sins.
In response to the points in the question:
1. "Either we can try to interpret what Jesus said to make it fit with the Trinity doctrine."
No. There is a word for when we take scripture and try to “make it fit” our presupposition. That word is eisegesis. Anytime we force our own meaning into scripture we are then no longer looking at scripture but our own perversion of it. Well known false religions of our day are guilty of this error.
2. "Can we reject what came out of Jesus' mouth?"
The Bible is very clear on this and it is implicit in the word itself, to be a "Christian" means to follow the teachings of the Christ. If you don't do this you cannot rightly be called a Christian, though many falsely carry that banner.