David Gaines, of Arden (N.C.) Christ School, confirmed the news to Scout.com.
"They really put a lot of effort into it," Gaines said. "His religion certainly was a factor but at the end of the day he fell in love with the coaches and the setting. At the end of the day, they play a style that is up his alley."
Harrison, a 6-foot-4, 175-pound wing prospect, averaged 12.5 points and five rebounds a game as a junior. He is rated as a three-star prospect on Scout.com.