If I understand you correctly, you're saying all knowledge is just a bunch of assumptions. This raises the question, how do you know that statement is true? On that view, you can only reasonably say, "I've assumed it." The belief that all knowledge is based on assumptions is just a rephrasing of the postmodern view that there is no objective truth (is that true?).

I don't want to sound like I'm attacking you here, but our beliefs about knowledge and truth are very consequential. If we cannot know anything aside from our assumptions, then all assumptions are equally valid (since we can't know which to discard). This naturally leads to situations where, e.g., racism is assumed to be good by one person, assumed to be bad by another, and there is no way we can determine who's right. In fact, "right" and "wrong" become meaningless because they're only assumptions, as does all language.