Freedom to "have or to adopt" a religion or belief necessarily entails the freedom to choose a religion or belief, including the right to replace one's current religion or belief with another or to adopt atheistic views, as well as the right to retain one's religion or belief. The freedom to "manifest" a religion or belief in worship, observance, practice and teaching encompasses a broad range of acts. The concept of worship extends to ritual and ceremonial acts giving direct expression to belief, as well as various practices integral to such acts, including the building of places of worship, the use of ritual formulae and objects, the display of symbols, and the observance of holidays and days of rest.