If I lack a belief in tooth decay, there is no reason for me to brush my teeth. So when someone defines atheism as a “lack of belief” How then can a person who defines them self in this way, act upon that? Only a positive belief is supported by action.
If I don’t believe in the Gold Gate Bridge, I don’t walk across it! This just demonstrates the irrationality of Atheism. all of it’s definitions are not cogent nor do they pass the preconditions for intelligibility.