I'd have thought the more obvious alternative is that belief in God has no impact on innate narcisstic tendencies, but that the nature of individuals' belief in

I'd have thought the more obvious alternative is that belief in God has no impact on innate narcisstic tendencies, but that the nature of individuals' belief in their relationship with God gets shaped by their narcissistic tendencies or lack thereof. (and some secular belief systems are much more dismissive of how "special" individuals are relative to groups and systems and processes, though narcissists can still try to find ways to be the best Communist, or one of the few temporary agglomerations of matter determined to be smart enough to acknowledge hard determinism!)