Spirituality--most any kind of meaningful activity. It is often separated from organized religious institutions, as in the phrase "spiritual but not religious". Traditionally, spirituality refers to a process of re-formation of the personality live a life according to divine will, but there is no single, agreed-upon definition of spirituality.
On the other hand, a gnostic atheist would be positive that god doesn't exist. Few atheists take this position. Most view god as irrelevant or that people who are adamant about gods' existence need to prove it.
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