Why race segregation in the Body of Christ makes the Church ineffective

The article, “Race, Diversity, and Membership Duration in Religious Congregations,’ said that nine out of ten congregations in the U.S. are segregated - a single racial groups accounts for more than 80 percent of their membership.

Romans 12:5 KJV

So we, being many, are one body in Christ, and every one members one of another.

Luke 21:10 KJV

Then said he unto them, Nation shall rise against nation, and kingdom against kingdom:

Galatians 3:28 KJV

There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.

1 Corinthians 1:13 KJV

Is Christ divided? was Paul crucified for you? or were ye baptized in the name of Paul?

John 4:9 KJV

Then saith the woman of Samaria unto him, How is it that thou, being a Jew, askest drink of me, which am a woman of Samaria? for the Jews have no dealings with the Samaritans.

Acts 1:8 KJV

But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.