  Interesting. The idea that there's one truth sounds so much like monotheism. To speak in a Nietzschean sense, the idea of one truth is a sublimation of the belief in and faith of one god. The same urge that drives men of and to one god drives others to one truth, and in sciences, one method (the scientific) of arriving at that truth. In many respects, belief in the scientific method is a belief in uncertainty. One must understand that scientific beliefs are predicated on the idea that they could indeed be incorrect. Of course, it's easy to come to believe absolutely in one's scientific conclusion(s). Twenty years ago, it was widely believed that there existed no planets other than those in our solar system.
Today we "know" of several. Science is a kind of faith in uncertainty. It is a sort of magic that is proven, very much as it was previously, via prediction. Astronomers predict Venusian solar transits. The transit occurs. The power of science, it's validity, it's sovreignty is thereby proven; very much as priestly power was validated by predictions of planetary movements, solar and lunar eclipses. So if we view Religion/Faith as having necessarily evolved I tend to think of Religion as preceding science because science is viewed as a modern method.
This view may be inappropriate. This view may be a stumbling block. Science and Religion have in common a faith in uncertainty driven by the desire to learn, understand, and control the known. We don't wish to be eaten, to die from enemies or the environment. So we're really discussing the sublimation of power and control (Nietzsche and Adler). 
