Atheism | Define Atheism at Dictionary.com
Atheism
1.the doctrine or belief that there is no God.
2.disbelief in the existence of a supreme being or beings.
rejection of belief in God or gods
[C16: from French athéisme, from Greek atheos godless, from a-1 + theos god]
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Atheism is the denial of the existence of God or gods (deity). As it is impossible to prove God does not exist, there is no supporting evidence that He does not exist.
If one then establishes for themselves a conviction that God does not exist, it must be a belief.
One can then go about attempting to give the reasons behind this personal decision, but these are ultimately subjective conclusions based on what one has observed.
I believe Atheism to be a secularist religion, in that it is a belief system with it's own customs, practices, and moral code.
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Religion | Define Religion at Dictionary.com
Religion
1.a set of beliefs concerning the cause, nature, and purpose of the universe, especially when considered as the creation of a superhuman agency or agencies, usually involving devotional and ritual observances, and often containing a moral code governing the conduct of human affairs.
2.a specific fundamental set of beliefs and practices generally agreed upon by a number of persons or sects: the Christian religion; the Buddhist religion.
3.the body of persons adhering to a particular set of beliefs and practices: a world council of religions.
4.the life or state of a monk, nun, etc.: to enter religion.
5.the practice of religious beliefs; ritual observance of faith.
Idioms
9.get religion, Informal.
a.to acquire a deep conviction of the validity of religious beliefs and practices.
b.to resolve to mend one's errant ways: The company got religion and stopped making dangerous products.