Jeff Call in Deseret News article reports 5% of BYU faculty are not LDS.
Jeff Call, "Religious freedom: What's BYU life like for non-LDS professors, students?" Deseret News, November 21,1999, accessed October 19, 2021
As of fall semester, of the 1,500 full-time faculty and visiting professors at BYU, 77 (5 percent) are non-LDS.