Speaking for myself, it's not my intention to use strawman arguments, I've been on the receiving end of them as well; they're very annoying. These conversations always seem to end at an impasse, but let me try again by asking a question rather than making an argument.

I can understand why someone would be an agnostic. Epistemological certainty is hard/impossible. But what I don't understand is if you're consistent about it how can anything matter? If you don't believe in any kind of base reality how can you have a basis for ethics, or even a belief that you live in the real world?