Which Religion Do i belong to if any?

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Definitions of religion on the Web:

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;

A religion is a set of beliefs concerning the cause, nature, and purpose of the universe, especially when considered as the creation of a supernatural agency or agencies, usually involving devotional and ritual observances, and often containing a moral code governing the conduct of human affairs.

Religion = Belief of some form of theism
Atheism = anti-theism

For a set of beliefs to actually be considered a "religion" there must be a belief of theism. Atheism does not have a belief of ANY form of theism.

Ask most atheists, ones that aren't dead set on spreading their belief, they don't consider themselves as a religious cult.