Why would you assume you are pointless scum? Non Theist world views operate differently from theistic world views because in Theistic world views meaning is drawn from an outside authority while in Naturalist world views draw meaning from individual or communal pursuits and inquiry. Calling yourself scum in a naturalistic world view makes no sense because you aren't nor ever were scum. You are a complex cellular being that experiences reality and came from a line of organisms that also experienced reality in various ways. The difference between a naturalistic view and a theistic view is if there is whether or not there are super natural beings and difference on authority. That is it.