Religious freedom is the right to espouse the religion of one's choice, or none. Religious freedom is guaranteed in the constitution of the United States and is a commonplace in democratic countries. However, in many states and countries secular and atheistic policies, particularly in the field of education, form in effect a restriction on religious liberties. Examples include the ban on classroom prayer in the United States, and opposition to the teaching of any alternatives to the discredited Theory of Evolution in many western nations. Ann Coulter said,