100% atheism is not incompatible with spiritual experience or practice, at least if you take seriously the claim that sam harris makes which is that what spirit

100% atheism is not incompatible with spiritual experience or practice, at least if you take seriously the claim that sam harris makes which is that what spiritual experiences all have in common is a perception of selflessness, combined with the observation that what we know of physics implies a lack of any distinct self, and what we know of psychology says all the things we think of as "self" don't map at all to our understanding of how the brain actually works.