“And He ( Jesus ) said, Abba, Father, all things are possible unto Thee; take away this cup from Me: nevertheless not what I will, but what Thou wilt.” Mark 14:36
Jesus is God, the Son of God the Father. He and the Father are One. Being God, Jesus was at the Foundation of the world, and even before, having no beginning and no end. For He, being One, is the Alpha and the Omega. He is also, per His own Words, the Way, the Truth, and the Life.
Why, then, did Jesus ask the Father to take the cup from Him?
Well, Jesus was not only God. Jesus was also a Man. He chose to live this life as a Man, never forsaking His Godliness. He chose not to utilize His Godliness to do a single thing while He lived the life He asked us to live. Had He done so, He would have negated His qualification to become the Sacrifice. Everything Jesus did which was of a Godly nature was performed through the operation of the third Person of the GodHead, the Holy Spirit. Knowing this, and knowing He was tempted and tried just like each of us, we can understand, then, how He must have felt facing a death on a Cross.
He had ministered to the apostles about the Plan of Salvation, and had spoken many times about being the Way. Even his followers, before they were first called Christians at Antioch, were known as followers of the Way. Yet, while He prayed to the Father about it not being His Will to go to the Cross (further proof He lived as a Man Who did not want to die), we see that in a way, Jesus sought another way to accomplish redemption. It is what the modern church is attempting to do, but the difference is that they are not truly seeking the Father on it, like Jesus did. They are seeking out teachers who say what it is they wish to hear, and are accepting it as true. If they were seeking the Father, like Jesus did, God would witness to them through the Holy Spirit that there is no other way but Jesus Christ crucified.
It was not easy to go through the Way ordained by God. Jesus Himself came up with the Plan and even volunteered to step down from His throne and become a Man; yet, as a Man, He was in agony over it. (Luke 22:44) He was strengthened by an angel as He continued to pray to the Father, seeking council, coming through the emotional battle of knowing He must die to the victorious acceptance of the Plan, that He may stand up and follow it through to the end.
As Christians, we are not better than our Lord. The Master was beaten, tortured, ridiculed, and killed, not for God, but for us. That last cup of sorrow is the only cup to have been drunk, and Christ drank it for us, that we should no longer be but mere sinful outcasts, but cleansed and made new and be able to come into the Presence of Almighty God. He was the Only One Who could have drunken it, because Jesus Christ is the Only Way to the One True God. Since He did for us what we could not do for ourselves, we should not be surprised, nor angered or vengeful, when we have to defend the Truth and walk in the path of worldly oppression. We should, however, continue to walk in the Way of righteousness, that is trusting in what Jesus accomplished for us. There is no other way.
“For the Lord knoweth the Way of the righteous: but the way of the ungodly shall perish.” Psalm 1:6