For any pyshical effect, there is a physical cause. This is a commonly held belief of anyone whose religious views lie in the physical realm. From this one can deduce that if souls and gods exist, their presence is irrelevant to the physical world. This is the case in that the statement "for any physical effect there is a physical cause rules out the possibility of a physical effect being caused by a non-physical cause. Thus, spirits, souls or even gods being immaterial would count as a non-physical cause and cannot cause any physical event. In this way, the material and immaterial world are divided and are mutually exclusive. There is nothing to say that immaterial thing cannot interact with other immaterial things, but no matter how long this chain goes, it cannot have any impact upon the physical material world. Thus, I find the existance of souls to be irrelevant and I see no reason to believe in them. While this premise is unproven, it seems difficult to conceptualize an immaterial object affecting a material object. An immaterial object cannot exert force or generate heat or force an electric impulse. So if a physical-immaterial interaction of this type could occur, what would be the mechanism through which it is done?