Many Puritans saw traditional feasts of the established Anglican Church, such as All Saints' Day and Easter, as an abomination. The Puritan rejection of Easter traditions was (and is) based partly upon their interpretation of and partly upon a more general belief that, if a religious practice or celebration is not actually written in the Christian Bible, then that practice/celebration must be a later development and cannot be considered an authentic part of Christian practice or belief—so at best simply unnecessary, at worst actually sinful.