MEMPHIS — 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!"

The young man was a member of a fight team at Xtreme Ministries, a small church near Nashville that doubles as a mixed martial arts academy. Mr. Renken, who founded the church and academy, doubles as the team's coach. The school's motto is "Where Feet, Fist and Faith Collide."

Mr. Renken's ministry is one of a small but growing number of evangelical churches that have embraced mixed martial arts -- a sport with a reputation for violence and blood that combines kickboxing, wrestling and other fighting styles -- to reach and convert young men, whose church attendance has been persistently low. Mixed martial arts events have drawn millions of television viewers, and one was the top pay-per-view event in 2009.