One has to be aware of any data for it to become a truth or untruth in perception. If you are unaware of any data/idea/concept, it does not exist for your mind. You must have experience of it in some form related to a physical sense. The congenitally blind or deaf do not know what colors or sounds are, respectively, because they have never experienced them.
Truth, for me at least, is a concept of the human mind. It is one thing to have an experience. Animals have experiences. But only human animals can question what we sense or think. Animals can only accept them blindly. We, solely, may be the only ones who can question our experiences because, thanks to imagination, we can perceive concepts beyond what we have experienced. We can mentally construct an alternate reality based on what we already know and then try to match it to or manifest it in our physical reality, no?
Even I accept many scientifically proven facts as truth. Like the universe, space, time, matter, forces, workings of life forms etc. Searching for the absolute truth of gods and religions is much harder because spiritual experiences and the histories of humanity's explanations of god is rife with uncertainties. People like me, who have had spiritual experiences, are much more willing to accept the potential, but unproven, reality that 'god exists' may be a truth. Depending on the strength of our experiences, we may even be certain its true. But atheists, who possibly rarely, if at all, have what they would deem as a spiritual experiences will find it much harder to reconcile their concept of the 'true' world with a theist's concept of the 'true' world.
I don't think too many people in this thread are seeking the absolute truth about scientific data. I would have assumed the absolute truth sought is more of a theistic nature. Of course, I could be wrong.