I am a Jew and I was in the Marine Corps. From day one when they asked the religion question, I responded with "no preference." The reason was it was clear from the start that there were guys in positions of authority in the Corps who had a prejudice against Jews. I attended services on holidays and all that, but officially I was "no preference." Lots of other Jews felt the same way. It seems to me you classified all of us who listed "no preference" as some form of Protestant. Besides, in terms of percentages, I don't think Jews are any less represented percentage wise than Episcopalians or a couple other Christians denominations according to your statistics when compared to the overall percentage of population in the US.