It's an interesting question, but it's kind of like the timeless question of the "meaning of life." If you believe in a Higher Power, it lends itself to believing that that same power has a universal truth. However, like the question of the meaning of life, to know the answer is to no longer be human.
In the meantime, the best we can do is create a fallible subjective consensus of what that "absolute truth" is. Indeed, many cultures have laid claim to "the truth," and, as a result, we've had widely different cultural practices over the millennia as a result of this. Even if you take the Bible as "absolute truth," give that same book to millions of people and you'll get widely different views of what that "absolute truth" is. That is ultimately why postmodernism made its claim about the illusion of "absolute truth," because it is technically unattainable in light of the fallibility of human thought. It is impossible to escape, no matter how thorough and how well-intentioned you are. With that, I never said that we shouldn't try and do the best we can.
Melon