Pastor Rench was saved while a student attending the University of Arizona, in the fall of 1971 under the ministry of J.C. Joiner, New Testament Baptist Church in Tuscon, Arizona. He was called to preach
in the fall of 1972 during a revival meeting held on the campus of Pacific Coast Baptist Bible College in San Dimas, California under the preaching of Evangelist Carl Hatch. Pastor Rench then graduated from P.C.B.B.C. with a Th.G. in 1975 and a B.A. in 1976.
While in college he served as youth pastor at Calvary Baptist Church in Yorba Linda, CA. Following that, he was Associate Pastor at Grace Baptist Church in Lebanon, OR, then pastored by Charles Engwall, his father-in-law. He founded Harvest Baptist Church in Corvallis, OR, which later merged with Bible Baptist Church in Albany, OR.
In 1981 Pastor Rench accepted the call to Pastor First Baptist Church in Coburg, OR. He led the church to purchase a larger facility in Eugene, OR, whereupon the name was changed to New Testament Baptist Church. He pastored there for 6 years. Then in 1987, the Renches moved to Temecula to start the Calvary Baptist Church. The first service was May 3,1987 with 3 local people in attendance. Calvary Baptist Church organized into a local independent Baptist church in 1989.