"We in the United States, above all, must remember that lesson, for we were founded as a nation of openness to people of all beliefs. And so we must remain. Our very unity has been strengthened by our pluralism. We establish no religion in this country, we command no worship, we mandate no belief, nor will we ever. Church and state are, and must remain, separate. All are free to believe or not believe, all are free to practice a faith or not, and those who believe are free, and should be free, to speak of and act on their belief.
At the same time that our Constitution prohibits state establishment of religion, it protects the free exercise of all religions. And walking this fine line requires government to be strictly neutral. And government should not make it more difficult for Christians, Jews, Muslims, or other believing people to practice their faith."
Source: Remarks by President Reagan
to Temple Hillel and Community Leaders in Valley Stream, New York