Icon depicting Emperor Constantine and the Fathers of the First Council of Nicaea as holding the Niceno-Constantinopolitan Creed of 381
A creed is a statement of the shared beliefs of a religious community in the form of a fixed formula summarizing core tenets.
One of the most widely used creeds in Christianity is the Nicene Creed, first formulated in AD 325 at the First Council of Nicaea. It was based on Christian understanding of the Canonical Gospels, the letters of the New Testament and to a lesser extent the Old Testament. Affirmation of this creed, which describes the Trinity, is generally taken as a fundamental test of orthodoxy for most Christian denominations. Accessed 17 May 2009 The Apostles' Creed is also broadly accepted. Some Christian denominations and other groups have rejected the authority of those creeds.
Muslims declare the shahada, or testimony: "I bear witness that there is no god but God, and I bear witness that Muhammad is God's messenger." Islamic Learning Materials. Accessed: 17 May 2009. See also A. Ismail Mohr. Accessed: 28 May 2012
Whether Judaism is creedal has been a point of some controversy. Although some say Judaism is noncreedal in nature, others say it recognizes a single creed, the Shema Yisrael, which begins: "Hear, O Israel: the our God, the is one."