UQD - do you take my point (see post on page 35) that there are many aspects of life (e.g. choosing whether to marry or not) where we do without the excessively high standards of Cartesian radical doubt? You seem to make out that there is a single standard of evidence for all facets of human existence. I doubt this. I see at least four epistemological levels where we try and understand what is true:
Logical or mathematical truth is at the high end of the scale, requiring 100% indubitability. This is Descartes position, and one which none of us could live by.
Empirical truth is not quite as strong, but good enough for most scientific enquiry. There is no absolute proof that having observed a particular phenomena in all of 100 cases that it will happen in the 101st, but most of us would be happy about it.
Another notch down is historical truth, which requires interrogating primary and secondary evidence to build up a picture of what probably happened. This is a weaker form again, but still relates to truth (i.e. the state of affairs as they actually are or once were).
And down from that is a lot of real life stuff, including aesthetics, a good deal of ethics and a good chunk of theology (although different theological branches do relate to logical, empirical and historical approaches to truth).
Many, many decisions we make relate to this fourth category. Often these are questions we cannot avoid (e.g. should we marry or not, what does it mean to love, is there such a thing as spirituality), but where some forms of evidence are not as abundant as others. That does not invlaidate these questions, it just shows that we have to adapt our methodology according ot hte nature of the question. And just as our methodology has to adapt to the nature of the question, so the nature of the answer we get has to be applied in a different way.
Where some religious people slip up is to apply a fourth order response (e.g. does God exist) as if it were first order/logically proven. I would say (as a Christian) that there is evidence for God, as good as the evidence by which I chose to commit my unobservable and unknowable future to a person by marrying them. But I recognise that I cannot impress my belief on others with the same force as, say, my belief that a triangle has three sides.
So, UQD, which is the universal epistemology that you use in all matters of human experience? Or do you, like me, see that different questions have to be approached in different ways?