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Here are a few definitions of religion for you...with links:

a strong belief in a supernatural power or powers that control human destiny; "he lost his faith but not his morality"
an institution to express belief in a divine power; "he was raised in the Baptist religion"; "a member of his own faith contradicted him"

http://wordnet.princeton.edu/perl/webwn

Religion—sometimes used interchangeably with faith or belief system—is commonly defined as belief concerning the supernatural, sacred, or divine, and the moral codes, practices and institutions associated with such belief. In its broadest sense some have defined it as the sum total of answers given to explain humankind's relationship with the universe. In the course of the development of religion, it has taken a huge number of forms in various cultures and individuals. ...

http://en.wikipedia.org/wiki/Religion

A framework of beliefs relating to supernatural or superhuman beings or forces that transcend the everyday material world.

http://www.modernhumanorigins.com/r.html

a set of attitudes, beliefs, and practices pertaining to supernatural power.

http://oregonstate.edu/instruct/anth370/gloss.html

generally a belief in a deity and practice of worship, action, and/or thought related to that deity. Loosely, any specific system of code of ethics, values, and belief.

http://www.carm.net/atheism/terms.htm