I believe that if one's education in public school did not include some attention the world religions (a study of their history, teachings), then one's education would be profoundly incomplete. I think that it would be impossible to claim to be well educated in the history of Europe, the near and middle East, Asia, the Americas, Africa without some knowledge of Judaism, Christianity, Islam, Hinduism, Buddhism, etc. One might be well educated in math, physics, chemistry, biology without such a background, but once one comes to terms with history, culture, art, philosophy, anthropology, sociology, psychology, medicine... I propose that it would be very difficult to avoid "a brief history of the principles [and history] of the world religions." You asked about the principles of philosophers as well as religion and, on that point, I also think it would be hard to claim to be well educated without some exposure to the philosophical principles that underlie a culture's history and governance. In my country, the United States, being self-aware about the history of the USA would, I believe, require understanding the philosophical principles behind the Declaration of Independence, the Constitution, the Bill of Rights, the causes behind the Civil War, and so on.
Read another response by Charles Taliaferro
Should a brief history of the principles of the world religions and philosophers be part of public school curriculum?