The acquittal of George Zimmerman in the death of Trayvon Martin reverberated from church pulpits to street protests across the country on Sunday in a renewed debate about race, crime and how the American justice system handled a racially polarizing killing of a young black man walking in a quiet neighborhood in Florida.

Lawmakers, members of the clergy and demonstrators who assembled in parks and squares on a hot July day described the verdict by the six-person jury as evidence of a persistent racism that afflicts the nation five years after it elected its first African-American president.

“Trayvon Benjamin Martin is dead because he and other black boys and men like him are seen not as a person but a problem,” the Rev. Dr. Raphael G. Warnock, the senior pastor at Ebenezer Baptist Church in Atlanta, told a congregation once led by the Rev. Dr. Martin Luther King Jr.

Dr. Warnock noted that the verdict came less than a month after the Supreme Court voted 5 to 4 to void a provision of the Voting Rights Act of 1965. “The last few weeks have been pivotal to the consciousness of black America,” he said in an interview after services. “Black men have been stigmatized.”