In the back room of a theater on Beale Street, John Renken, 37, a pastor, recently led a group of young men in prayer.

“Father, we thank you for tonight,” he said. “We pray that we will be a representation of you.”

An hour later, a member of his flock who had bowed his head was now unleashing a torrent of blows on an opponent, and Mr. Renken was offering guidance that was not exactly prayerful.

“Hard punches!” he shouted from the sidelines of a martial arts event called Cage Assault. “Finish the fight! To the head! To the head!”

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