You forget one thing. If morality is subjective and science doesn't have anything to say about it, that doesn't mean that religion does.
Dragoonster said:
So? Maybe NOTHING has anything objective to say about morality. Maybe morality is purely subjective.
Actually, science can tell us everything there is to know about things that are subjective. For example, ice cream preferences are purely subjective. Tell me anything useful about ice cream preferences that science cannot (in principle, we may not have figured it out yet) tell us.
Science can figure out what happens when different people taste ice cream. They can assess ice cream preferences in the population. They may find correlations between ice cream preferences and mental states. They may be able to measure how much pleasure different people experience when they try different ice creams and tell us why some people like vanilla more than chocolate. They may be able to scan my brain and craft the ultimate ice cream flavor for me or tell me why and how much I will and won't like all flavors.
There is nothing useful about something subjective that science cannot (at least in principle, we may not know yet) tell us. I think you'll find that anything that would actually be useful would necessarily be amenable to scientific study for precisely the same reason it would be useful. If it has effects, we can study them scientifically. If it has no effects, what difference does it make?
Also, Dragoonster, subjective things are a type of objective thing. "Subjective" and "objective" are not opposites. Everything subjective is also objective, but not everything objective is subjective. For example, the size of a mountain is purely objective. But how big a mountain looks to a particular person from a particular point of view is subjective. Nevertheless, it is also objectively determined by the person's location, the nature of human vision, their distance from the mountain, and so on.
Subjective properties are completely amenable to objective analysis and understanding. We can understand the input objectively, we can understand the process objectively, we can understand the output objectively. What is left that we can't understand scientifically? There is nothing beyond the input, the processing, and the output.