Monotheism

Monotheism is the belief in only one god, rather than the two (dualism) or more (polytheism) as in Ancient Greece, Ancient Rome, Ancient India and Ancient Egypt.

Many religions are monotheistic, such as Judaism, Christianity, Islam, Baha'i Faith, Sikhism, Eckankar, Zoroastrianism, Cao Dai and Tenrikyo. Some pagan and neo-pagan religions are also monotheistic. 

Deism is the belief that a higher being like god exists but not many gods, revelation, religions, rituals, sacred books (like the Bible or Quran), prophets (like Jesus or Muhammad), etc.

Judaism and Zoroastrianism are thought to be the oldest living monotheistic religions.

 Other websites 
 Stanford Encyclopedia of Philosophy

Category:Theology
Category:Philosophy of religion