One of the more interesting religious groups in U.S. history was what is commonly known as the Shakers. Founded in the 18th century, the communal group established itself in the American colonies, preparing for God's will to be done on earth. Most people know them for their music and furniture, which stress simplicity.
They also encouraged celibacy, viewing sex as the root of much evil since the time of Adam and Eve. That strict adherence to celibacy is one of the main reasons why there are almost no Shakers left in modern America.
Watching the troubles of Roman Catholic healthcare today, you have to wonder if Catholic hospitals might also be on a belief-induced path to extinction. Controversies over abortion and reproductive health have roiled many of these facilities in recent years. Now, the Catholic bishops are objecting to requirements in the healthcare reform law that insurance plans make contraceptive coverage available to beneficiaries. The clerics, joined by some conservative politicians, insist that this is a violation of the constitutional right to freedom of religion.