Sunday morning remains one of the most segregated hours in American life, with more than 8 in 10 congregations made up of one predominant racial group.

And most worshipers think their church is fine the way it is.

Two-thirds of American churchgoers (67 percent) say their church has done enough to become racially diverse. And less than half think their church should become more diverse.

Those are among the findings of a study of church segregation by Nashville-based LifeWay Research. Researchers surveyed 994 churchgoers—who attend worship at least at holidays or more often—about race and the church. They also surveyed 1,000 Americans as well as 1,000 Protestant senior pastors.

Churchgoers, researchers found, are lukewarm about diversity. More than half (53 percent) disagree with the statement, “My church needs to become more ethnically diverse.” Four in 10 agree.

Researchers also found churchgoers who oppose more diversity do so with gusto. A third (33 ...

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