From Merrriam-Webster's Dictionary
Main Entry: god Pronunciation: \ˈgäd also ˈgȯd\
Function: noun
Etymology: Middle English, from Old English; akin to Old High German got god
Date: before 12th century
1 capitalized : the supreme or ultimate reality: as a : the Being perfect in power, wisdom, and goodness who is worshipped as creator and ruler of the universe b Christian Science : the incorporeal divine Principle ruling over all as eternal Spirit : infinite Mind 2 : a being or object believed to have more than natural attributes and powers and to require human worship; specifically : one controlling a particular aspect or part of reality
3 : a person or thing of supreme value
4 : a powerful ruler
Main Entry: re·li·gion Pronunciation: \ri-ˈli-jən\
Function: noun
Etymology: Middle English religioun, from Anglo-French religiun, Latin religion-, religio supernatural constraint, sanction, religious practice, perhaps from religare to restrain, tie back — more at rely
Date: 13th century
1 a : the state of a religious <a nun in her 20th year of religion> b (1) : the service and worship of God or the supernatural (2) : commitment or devotion to religious faith or observance
2 : a personal set or institutionalized system of religious attitudes, beliefs, and practices
3 archaic : scrupulous conformity : conscientiousness
4 : a cause, principle, or system of beliefs held to with ardor and faith
Main Entry: spir·i·tu·al·i·ty Pronunciation: \ˌspir-i-chə-ˈwa-lə-tē\
Function: noun
Inflected Form(s): plural spir·i·tu·al·i·ties
Date: 15th century
1 : something that in ecclesiastical law belongs to the church or to a cleric as such
2 : clergy
3 : sensitivity or attachment to religious values
4 : the quality or state of being spiritual