Why is there so much disunity (and often hostility) among Christians and Christian groups? Even within the biggest category, Protestantism, there are many different denominations and divisions.
There’s a strong emphasis on unity in the New Testament, including Jesus’ prayer:
“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—so that they may be brought to complete unity. Then the world will know that you sent me and have loved them even as you have loved me. (John 17:20-23)
Why is there such a dichotomy between what scripture pushes and actual practice in America? I believe it is part of the besetting sin of America – the tendency of the different groups who want to feel that they are superior to others. In addition, ever since the Fall of man, Satan has been the ruler of the earth (albeit subject to God’s overall control). That corrupts so much in our society including our practice of Christianity just as it did in Jewish history.
The good news is that we actually have a great deal in common with each other on the really important stuff. For one thing, there are the creeds which the universal church agreed on early in church history:
Some other scripture-based things almost every Christian group agrees with:
a) Scripture is inspired by God.
b) You have to accept Jesus as your Lord and Savior for the payment of your sins
And then there are the core teachings of Jesus which most Christian groups agree with:
1) We must love God wholeheartedly and others as ourselves:"Love the Lord your God with all your heart, all your soul, and all your mind and… equally important, love your neighbor as yourself. (Matt 22:37, 39) Jesus emphasizes the prominence of them with the next verse: “The entire law and all the demands of the prophets are based on these two commandments.” He also repeats these themes throughout his ministry and condemns the Pharisees for being sticklers on lesser things yet blind to knowing and loving God.
2) That we must be part of the vine (John 15:1-11), which means having a very close growing relationship with Jesus and producing fruit. Otherwise, we may be cut off from the vine.
3) That we must avoid Pharisaism. One of the most recurring themes of Jesus (at least 2 dozen times) is his strong denunciations of Pharisees, who were arrogant and promoted a legalism about the rules while missing the more important things, like the top two commandments.
So, consider this, we hold arguably hold the overarching heart of Christianity in common!
In some groups, there are deeper theological differences, although there can be people within the group who love God, follow and grow in Jesus.
We need to recognize the key things that unite us. For the sake of unity, we need to be able to say, “I have differences with you on thus and such, but we are still brothers/sisters in Christ.”
We Americans tended towards judging others and considering ourselves and/or 'our group' as superior before the Twin Towers came down on 9/11. However, a lot of that division went away for quite awhile. We realized that we had a shared greater uniting thing - each other and our country. That is what we need within the church (come to think of it we also need it in our country again also).