President Bush's remarks highlighted one of the most important rights guaranteed to US citizens, which has been copied by many other countries. Freedom of religion is guaranteed to American citizens by

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

A) the First Amendment to the Constitution.