Sounds more like a persecution complex on your part than prejudice on theirs. If they really hated Mormons, they wouldn't wants schools in Utah, Colorado, California or Arizona where most Mormons live. Utah has played better football since Lavell Edwards left BYU, and SLC is a much better market than Provo to have in your conference.
Believe it or not, the University of Utah is filled with Mormons. J. Willard Marriott, Thomas Monson, Lavell Edwards and Stephen Covey are all U alumni.
I agree that BYU would be a great fit for the PAC-12, but making ridiculous, unfounded accusations against the entire conference that are easily refuted makes BYU look unfit for any conference.