Even our most fundamental 'knowledge' about this world is subject to review. We once considered "the world is flat" to be knowledge, but we now know that this statement doesn't even fulfill the most basic requirements you set forth - truthfulness.
I would simply define knowledge as a belief which is justified beyond reasonable doubt - that's as good as you will ever get. You need to be willing to accept that human knowledge is not necessarily truthful.
That's very true - a lot of our knowledge is subject to revision and changes in scientific paradigm. I do think, however, that it is possible to obtain workable objective knowledge about the world - objective to the extent that it can be used for many applications. I don't accept, and I don't think that you do either (if I'm interpreting what you say correctly) that all knoweldge is relative in nature. Relativism is very defeatist, and an objection to it can be: if all knoweldge is relative, and we can never find objective truth, how do we explain human successes with complex knowledge? Things like medical knowledge, if not truthful, would not be able to save patient's lives... I wrote a mini-essay on the relativist/objectivist debate on my blog somewhere, I can post it into a thread if you're interested in reading it.
Having said that, I can now reiterate: you are using a strange definition of 'knowledge'. If we think, we obviously exist. This belief can be considered knowledge, because it is justified beyond reasonable doubt.
Well herein lies the rub. Against Descartes' 'unreliable reasoning' skeptical argument, there is not reasonable justification. The faculty that forms the basis for the justification, which is thinking or reasoning, is under doubt, and so cannot be used to form adequate justification for the belief.
I also wrote an essay for my uni course on foundationalism and coherentism that I can post somewhere if you want to read more about it... I think that a combination of the two theories is probably the most satisfactory way of concieving knowledge.
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