"I pray that they will all be one." - John 17:21
That was Jesus' prayer. He knew his time was ending here on earth and he was going to return to his Father. He starts his prayer by praying for His relationship with God, then for His disciples and then for all future believers. How reassuring to know Jesus prays for us. Yes. You and me.
The human population is a diverse population. It's a tall order for unity. I think it's important for us to see unity as a state of being jointed as a whole. It's doesn't mean we have to have all the same opinions or stances on religion, political, social, economical issues. We are to be jointed in Christ as a whole body. We are the body of Christ. The church. The church can look different, worship different, maybe even have differing doctrinal stances but it needs to be united in Christ.
To put plainly.... it's doesn't matter if you believe in infant baptism or believers baptism. What matters is that someday you begin a new life with Christ - the Old is gone the new has come.
Jesus' prayer in John 17: 20-26 is beautiful and powerful. It shows his desire for us to live in him. To have the unity with us as he has with his Father. It's through this unity that the world will see God and his love.
Read John 17:20-26. And then re-read it again and again. Feel the power behind the word Unity. Unity with each other and unity with Jesus.
Then challenge yourself to seek it.