HILLSBORO, Kan. — Ryne Preheim wanted to be a Mennonite Brethren pastor. He enrolled at Tabor College in the fall of 2014 to pursue that goal and see if he could reconcile his Christianity with being gay. A year later, Preheim is preparing to transfer after struggling with being an openly gay student at a college that upholds a traditional view of homosexuality. But Tabor is also experiencing dissent, including from alumni who believe it should be more welcoming of LGBT students.