Is it stupid? There's a whole aspect of philosophy based around what we "know" and what we do not "know". I'm ok with saying we don't "know" many things. We have observations and beliefs, often justified, often indefeasible, but those do not necessarily constitute knowledge. As such, you can say I'm truly agnostic, I have my observations and beliefs and justifications but I accept that in some cases I don't "know" things.