As the appearance of the bow that is in the cloud in the day of rain, so was the appearance of the brightness round about. This was the appearance of the likeness of the glory of the Lord. And when I saw it, I fell upon my face, and I heard a voice of one that spake (Ezekiel 1:28, KJV)
We can indeed find prominent use of the rainbow in the beginning, middle, and end of Scripture. Near the beginning in Genesis, God sent a rainbow as a sign of His covenant that He would never again flood all the earth as punishment for human sin. In the middle, in Ezekiel, the rainbow symbolizes the coming of Christ, as well as declaring the glory of God. And in Revelation, at the end of God’s Word, John described Christ as “clothed with a cloud: and a rainbow... upon His head” (10:1 KJV), a symbol of peace and reconciliation with God.
God never intended the rainbow to be a symbol of diversity or a symbol to represent as good what God calls evil. God gave us the rainbow as a symbol of the trustworthiness of His promises—as a symbol of hope in Him.