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A satanic group in Oklahoma will hold a public “black mass” ceremony Sept. 1. The move has drawn the ire of Catholic leaders who say the mock ritual is offensive to Christianity. Stock/postaldude66

A devil worshiping group known as Dakhma of Angra Mainyu is causing a stir in Oklahoma -- and spurring debate about First Amendment rights. The organization plans to hold a satanic “black mass” ceremony that mocks certain rituals practiced in Christianity, according to ABC News. The group faces a lawsuit from the Catholic Church over the satanic group possessing a consecrated host, a wafer that many Catholics believe is the literal body of Jesus Christ.

Black mass events typically involve the use of human urine to mimic holy water, but the event in Oklahoma City, slated for Sept. 21, will be a “tamer” version as the mass will be conducted in public. "One of the dictates of the church is not only to educate the members but to educate the public,” Dakhma of Angra Mainyu’s co-founder Adam Daniels told ABC News. He said the purpose of having the ceremony in public is “to debunk the Hollywood-projected image of our beliefs.” The group will use vinegar instead of urine, Daniels said, to satisfy state health laws.

A city spokeswoman who represents the civic center theater where the black mass will take place said there will be “no bloodletting of any kind,” according to the New York Daily News.

Catholic leaders in Oklahoma tried unsuccessfully last month to put the kibosh on Dakhma of Angra Mainyu’s black mass ceremony. The archbishop of Oklahoma City said he was “concerned” about what he called the “spiritual danger” posed by the satanic group.

Oklahoma City officials cited First Amendment protections in allowing Dakhma of Angra Mainyu to hold its event at the civic center. Daniels said ritual participants will wear obscene costumes, use explicit language and defile a symbol of Christ, according to the New York Daily News.