Isn't a policy a statement of certain principles founded on beliefs? The hypocrisy is soooooooo apparent.
The truth is that Vanderbilt has a rigid orthodoxy which nobody is permitted to question, which is that homosexuality and any other form of sexual conduct must be approved of and treated equally with married heterosexual behavior.
If your group holds religious beliefs that conflict with that orthodoxy, keep them under your hat and forget about living them out if you want your group to continue to be under the aegis of the university.