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« on: March 07, 2017, 04:18:23 pm »
Unfortunately yes. There's always room for the good ol' evil deceiver or its equivalent to be stuck somewhere in things. Solipsism always wins if you're not going to do what you should and tell it to bugger off once you reach whatever point of absurdity is appropriate to the particular discussion. Generally we just roll with less than whole knowledge states and get along pretty alright.
Though yeah, a nontheist doesn't require much faith, if any. Certainly significantly less than most/all more metaphysically burdened positions to have on theism, and what faith they do require is mostly not of the religious sort. Usually if someone's saying otherwise they're trying to hoodwink you one way or another, heh.
Materialism or evolution can totally tell you what you ought to do, though. Sorta'. There's optimal or necessary paths to achieve whatever goal you're aiming at that can be decided on (with whatever degree of functional effectiveness) using principles that aren't in violation of either sort of thing. They're not exactly able to tell you what you ought to do on their own, though. They're not prescriptive systems, though certain strains of materialism might be. Can't even tell you what's practical, tbh. Just what is.
That said, nothing can establish an ought without there being a goal to ought towards. Religions tend to presuppose whatever their goal is (heaven, escaping resurrection, whatever) is the one being aimed for, but that doesn't give them particularly special grounds on that front. Anything that provides a framework for effectively accomplishing a goal can tell you an ought, to one extent or another.