Soxy, it is a very good letter, but not Fred's original material. The letter has been circulating on the internet for several years. I found sources for it as far back as early 2000. It seems to have been picked up by a number of religious sites who have given serious responses to each of the questions. I suspect that it is a satire piece. In fact, I did locate a writer's group thread devoted to Dr. Laura and the letter was there.
In any case, a nice piece of writing, worthy of posting on the thread.