I’ve never really cared for the word, deconversion. The actual meaning of the word, as a noun, is that it’s a return, from some religious belief to a previous belief or none at all. For many, if not most atheists I know, they never had a chance to deconvert, because they never converted to their religious belief initially. Think about it. A child of parents from any religion automatically raise them to believe what those parents believe. Small children always, at least in my experience, want to please their parents, so it’s easy for them to take on those characteristics the parents indoctrinate them with, whether good or bad.