In my experience, atheists tend to misunderstand, or at least misrepresent the "scientific method". It's never been restricted to demonstrated cause/effect relationships as they tend to *require* when it relates to the topic of God. Orch-OR theory is an excellent example of a typical "scientific theory" that might explain the concept of a "soul", and might explain how such a thing survives physical death.
Atheists tend to "take it on faith" that all the various mass/energy elements of Lambda-CDM are correct, even though not a single one of them actually has any tangible effect on a single photon in a real empirical experiment. On the other hand they *require* a demonstration of cause/effect relationships as it relates to the topic of God. It's a blatant double standard. Most of them don't even understand either the scientific method, or current theories about "reality"/the universe. They just "have faith" in anything labelled "science", so long as it's not related to the topic of soul or God.