"Some post death action to a body beyond what is strictly necessary from a public health standpoint" is not the definition of religious effort though. It has nothing inherent to do with worship, gods, faith, afterlife, or the supernatural anymore than the "belief" if you pay for shipment of something it'll probably make it that even if you're not around to see it and that sounds fun. After all, not everything people do beyond the bare necessities of public health is about religion.