I CAN SEE from the Daily News' Friday editorial ("A Penn professor gets a lesson from Bush") that you are puzzled, dismayed and disappointed by my statements of last Monday concerning the Esquire magazine article. You may not like or accept my reasons, but I will give them. Sixteen months ago, I left the White House after serving the half-year I publicly said I would when I took the job. I stayed just long enough to complete the only task at which I had any special skill, namely "Unlevel Playing Field," a study exploring how government discriminates against grassroots religious...