Yes, doctrinal unity is important. It is okay for believers to hold conflicting and contradictory doctrines and I challenge you to show me any two individuals that believe exactly alike in every detail? Can you name two?
Well, let’s see what the Word of God has to say. If you have your Bible handy, you can highlight these passages for future reference.
First, He prayed for unity among his own disciples:
“Holy Father, protect them by the power of your name—the name you gave me—so that they may be one as we are one.” (John 17:11)
Jesus prayed that the Apostles might have the depth of unity that He shares with the Father. Was He praying for unity among his Apostles only? No! He prayed for all who would hear and believe these Apostles:
"My prayer is not for them alone. I pray also for those who will believe in me through their message, that all of them may be one, Father, just as you are in me and I am in you. May they also be in us so that the world may believe that you have sent me. I have given them the glory that you gave me, that they may be one as we are one: I in them and you in me. May they be brought to complete unity to let the world know that you sent me and have loved them even as you have loved me.” (John 17:20-23)
Jesus is saying that the unity of a single, visible church would be proof that He really was sent into the world by the Father. The unity of the church is supposed to be a witness to this fact. In order for the world to know the truth, it must be able to see a visible, unified church.
Just as Jesus and the Father are perfectly united, so God desires for the Apostles and those who come to believe in Jesus through them to be united. The reason for this unity is clear: to let the world know that you sent me”. Without this unity, the witness of the Christian Church to the world is weakened and as a result, the souls who fail to recognize the truth may be lost. Thus, the world must be able to see the unity of a visible, authoritative Church and hear the truth it proclaims. What are signs of this unity that the world should see?
One of the signs must be doctrinal unity on matters of faith and morals. In the pages of Scripture, we read:
“All the believers were one in heart and mind.” (Acts 4:32)
“There is one body and one Spirit—just as you were called to one hope when you were called—one Lord, one faith, one baptism; one God and Father of all, who is over all and through all and in all.” (Eph 4:4-6)
“I appeal to you, brothers, in the name of our Lord Jesus Christ, that all of you agree with one another so that there may be no divisions among you and that you may be perfectly united in mind and thought.” (1 Corinthians 1:10)
The Father desires that the Church should be of one mind regarding the faith and doctrinal matters such as the “one baptism” just as He and the Son are one.
The Father and the Son do not disagree on any issue. Does the Father prefer infant baptism while the Son does not? In the same way, we should have no divisions, no denominations, that separate us from one another. Paul’s appeal is not about some idealistic, invisible unity but a real, visible, tangible unity.