I was excommunicated from my church because I didn't agree with how another member was treated. I simply told them that I thought they were being too harsh.

They used Matthew 18:15-17 as a basis for bringing me before the entire church and excommunicating me. What does the Bible say?

First, I don't believe that Matthew 18 applies to your situation. Disagreement should never be a reason for excommunication. Let's examine Matthew 18:15-17.
Moreover if your brother sins against you, go and tell him his fault between you and him alone. If he hears you, you have gained your brother.

But if he will not hear you, take with you one or two more, that by the mouth of two or three witnesses every word may be established. And if he refuses to hear them, tell it to the church. But if he refuses even to hear the church, let him be to you like a heathen and a tax collector.
(Matt. 18:15-17)
This text deals with a Christian sinning against another Christian. It explains how to deal with being wronged. When a wronged person confronts the offender (in a spirit of love), but the other person refuses to repent, then the church should be informed.

In reality, no one should have fellowship with that individual. This should cause shame and eventual repentance.

However, in regard to your situation, as a member of a church, you should have an opportunity to indicate to those in authority that you are in disagreement with what was done. The board or pastors should share their hearts and present Scriptural reasons for their decisions.

If you still do not agree, do not murmur or gossip about the leadership. Pray and decide whether to stay or leave. Speak no evil about the church or its people. Your honorable conduct will provide a way for God to act on your behalf.

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