Grad school acceptance or denial is a tricky thing. You never know what they consider and don't, or what the weight of those considerations will be. You don't know what your competition is, and you have no idea how much of the competition they plan on taking. You get little help from the department and then get little feed back. In short it would be a very tricky thing to assess how many graduates from Bob Jones University get denied grad school admission based upon accreditation. Normally you just get a nice letter saying better luck next time.