I have heard rumours through the academia grapevine (totally unsubstantiated, of course) that there may have been something concerning not only saying "no" to non-christians, but also to christians of certain sexual orientations or preferences. They're not just a general CU, but an Evangelical CU - and I hear that the powers that be weren't prepared to let them restrict things that much whilst they were still being funded by the student's guild.