Dozens of colleges have scrutinized how on-campus Christian groups operate after a U.S. Supreme Court ruling allowed a law school to deny funding to a Christian group that would not admit gays.The 2010 ruling touched on gay and religious rights on campus, and the tension is now at the center of a handful of disputes at colleges.A chapter of the Christian group InterVarsity at the University of Buffalo was temporarily suspended. The student government is evaluating its groups after a treasurer, who is gay, felt pressured to step down.The University of North Carolina is reviewing its student organizations after a Christian singing group expelled a gay member. And at Vanderbilt University, a private college in Tennessee, Christian groups were asked to change requirements that their leaders also be Christian.