You people are getting very muddled. Or perhaps, to be kinder, it's because you are trying to adopt a middle ground in the interests of board harmony.
Firstly, atheism is not a cosmological position. An atheist does not posit anything, or affirm any statement about the nature and origin of time and the universe. The atheist merely looks on with bemusement as those for whom religion is meaningful discusses something which to them seems entirely meaningless.
Secondly, some of you are confusing generalised scepticism as the starter epistemological position, adopted playfully by various philosophers with points to prove about knowledge and belief, with viable approaches to the practical business of knowing what is knowable and what is not.