HOUSTON — After a three-year search, First Baptist Church, Houston, one of the largest congregations in the country, elected a 33-year-old college minister as pastor. Gregg Matte, who leads a ministry to students at Texas A&M University, was elected by the 22,000-member church April 11 to succeed John Bisagno, who retired in 1999 after 30 years as pastor. Matte (pronounced…