No, in "Abrahamic" religions we don't have a "spirit". According to those religions people have immortal soul, which is definitely not a "spirit". The "spirit" thing inside people that might "be freed" and haunt some secluded house is something coming from the domain of cheap horror movies and pseudo science TV shows. By definition souls is not something measurable, it does not belong to physical world so no amount of physics or neurology can "explain it", prove it existence or nonexistence. (I am theoretical physics PhD and Roman Catholic).