Have Churches Been Effective In Changing The Hearts Of Racists?

The movie Selma chronicles a period in American history when the church-led Civil Rights Movement was effective in exposing the horrors of southern racism. The tactic of non-violent direct confrontation was meant to shame hateful people into stopping their violent behavior. After seeing how ugly their hateful behavior looked before the world, some whites actually did become ashamed. But today, many whites and other non-blacks find many excuses to allow, condone and even promote hateful, racist behavior. Are churches effective in changing the hearts of racists? Or is racism and white supremacy too ingrained into American culture? Is racism a mental illness or spiritual illness? Is it possible to eradicate it from American society?