Lack of belief in God(s), through simply self belief, awareness or even after having rejected claims of existence is a simply definition of atheism. According to the Encyclopedia of the Social Sciences, edited by Edwin R. A. Seligman refers to atheism as:
Moreover, as people generally do not discriminate between belief and conduct, the term atheist has also been applied to those who refuse to participate in the customary forms of public worship. Thus the Romans called the Jews and early Christians atheists because they did not pay the customary honors to the sacra of the established imperial cult.
However the argument before us begs the question of religious alignment with morality. It is often assumed that one cannot possibly be moral, uphold moral values unless coupled with a belief in god(s). Similarly morality is presumed to go hand in glove with religious morality, while any probability of morality devoid of religion is ignored and stymied in significance. The acclaimed philosopher John Stuart Mill in his Autobiography Of John Stuart Mill says "The world would be astonished if it new how great a proportion of its brightest ornaments, of those most distinguished even in popular estimation for wisdom and virtue, are complete skeptics in religion. (Chapter II Moral Influences in Early Youth. My Father's Character and Opinions" (1873). Thus this negates one argument that religion can be aligned to morality.
Looking at the inverse of the above argument, i.e. ...