Atheism and religion

Some movements or sects within traditionally monotheistic or polytheistic religions recognize that it is possible to practice religious faith, spirituality and adherence to tenets without a belief in deities. People with what would be considered religious or spiritual belief in a supernatural controlling power are defined by some as adherents to a religion; the argument that atheism is a religion has been described as a contradiction in terms.

In general, formulations of Jewish principles of faith require a belief in God (represented by Judaism's paramount prayer, the Shema). In many modern Jewish religious movements, rabbis have generally considered the behavior of a Jew to be the determining factor in whether or not one is considered an adherent of Judaism. Within these movements it is often recognized that it is possible for a Jew to strictly practice Judaism as a faith, while at the same time being an agnostic or atheist. Reconstructionist Judaism does not require any belief in a deity, and certain popular Reform prayer books, such as Gates of Prayer, offer some services without mention of God. Jewish atheists who practice Humanistic Judaism embrace Jewish culture and history, rather than belief in a supernatural god, as the sources of their Jewish identity. One study found that only 48% of self-identified Jews believe in God.

Rabbi Abraham Isaac Kook, first Chief Rabbi of the Jewish community in Palestine, held that atheists were not actually denying God: rather, they were denying one of man's many images of God. Since any man-made image of God can be considered an idol, Kook held that, in practice, one could consider atheists as helping true religion burn away false images of God, thus in the end serving the purpose of true monotheism.

High rates of atheism have been found among self-identified Christians in the United States. For example, 10% of self-identified Protestants and 21% of self-identified Roman Catholics were found to be atheists in a Harris Interactive survey from 2003.

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