Maybe I have been influenced more by Kuhn than I ought.
But, anyway, isn't knowledge defined as justified true belief? If science is a naturalistic method of increasing knowledge is it then also true to say that it is in the business of creating justified true beliefs in its practitioners?
Think of it this way. Honestly, I haven't observed much evolution (though I do get the flu every year, so maybe that's something). Or , for that matter, tectonic plate movement (despite living in California). I have a belief that these things occur. Many different authorities have told me so. However, because I have a distinct lack of education in these matters (no biology or epidemiology, and I couldn't even tell you what field studies tectonic plate movements), you might say that I don't have knowledge. Why? Because my beliefs aren't justified, even if they are true.
Scientific enterprises of various kinds, should I desire to enter into them, would justify my beliefs.
I would dare say that most people walk around with their heads filled with beliefs that are true but are not, for one reason or another, justified.
Now, to bring it around to the question at hand, this country was founded on the proposition that all man are endowed by nature and nature's God with certain unalienable rights, i.e., natural law exists, is true, and is operative in human life. Is the belief in natural law justified or is it, at least, theoretically justified? (Maybe I or you aren't smart enough to have justified true beliefs in natural law, but somewhere, someone is.)