Even Christians have disagreements.

We have denominational differences, disputes about theology, and all manner of divergent opinions on politics, witnessing, ways of living, and so forth.  We are all seeking truth, but we're also human.  And sometimes we get frustrated with one another.

This was true even in the early church, although the issues there were different.  Even Paul and Peter, two of the most influential members of the young Christian church, had a public dispute about theology.  Paul writes about this dispute in the book of Galatians, realizing that the church there is already divided.

After addressing the specific issues at stake in his disagreement with Peter, Paul writes about the division of the church, and the need for appropriate behavior toward one another:

Galatians 5:13-26 (NIV)

You, my brothers, were called to be free.  But do not use your freedom to indulge the sinful nature; rather, serve one another in love.  The entire law is summed up in a single command: "Love your neighbor as yourself."  If you keep on biting and devouring each other, watch out or you will be destroyed by each other.

So I say, live by the Spirit, and you will not gratify the desires of the sinful nature.  For the sinful nature desires what is contrary to the Spirit, and the Spirit what is contrary to the sinful nature.  They are in conflict with each other, so that you do not do what you want.  But if you are led by the Spirit, you are not under law.

The acts of the sinful nature are obvious: sexual immorality, impurity and debauchery; idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions and envy; drunkenness, orgies, and the like.  I warn you, as I did before, that those who live like this will not inherit the kingdom of God.

But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control.  Against such things there is no law.  Those who belong to Christ Jesus have crucified the sinful nature with its passions and desires.  Since we live by the Spirit, let us keep in step with the Spirit.  Let us not become conceited, provoking and envying each other.