UG:
Thoughtful Christianity doesn't presume to know with absolute certainty all of life's mysteries. Even Paul, who wrote a large chunk of the New Testament, said, "We see through a glass darkly." However, Genuine Christianity does claim that certain mysteries have been "revealed." Without that revelation, those mysteries are beyond the scope of human reason. They are not purely rational, but they are certainly not irrational.
For example, Christ reveals the mystery of God in human form, in a way we can understand (see Colossians 2:2-10).
I understand a reaction against authoritarian religion that abandons informed idealism and squelches dissent in a blind attempt to maintain control. This is the medieval religion that silenced Galileo. But is that mindset a genuine representation of Christianity?
Ptolemy, in his Amalgest, in the third century A.D., informed the world of his day that, compared to the size of the universe, the earth was so insignificant that it could only be measured as a mathematical point. Yet this did not offend Christianity. In fact, Christianity prospered in learning centers during the third and fourth centuries. Consider Alexandria, Egypt. Genuine Christianity recognizes that God is immense, that His paths "are beyond tracing out." (Romans 11:33-36) If such a God is the infinite and immense Ground, then an immense and often untraceable universe is the logical Consequent.
Furthermore, genuine Christianity has always taught that the physical universe is much like the universe that qunatum physics is now perceiving.
You use the following scientific terminology:
<< From Relativity: 'Absolute knowledge' has meaning only on a local scale where shared experience leads to agreement as to what it is. >>
But Scripture, in a more poetic and philosophical form, says much the same thing:
<< He who thinks he knows something does not yet know as he ought to know. >>
<< From Quantum Mechanics: The closer you look, the less certain you can be that you are seeing anything at all. >>
But Scripture says, "For what is seen is temporary, but what is unseen is eternal." (2 Cor 4:18b) Just before that verse, Paul contrasts the "light and momentary" nature of this physical world and all its trials with the "weighty ang glorious" world of the Unseen.
Genuine truth flourishes when:
1) the saint is free to say his prayers and experience the blessings of the Unseen (and seek to communicate them to others).
2) the scientist is free to conduct his experiments and use his increasing knowledge of the natural realm for the physical benefit of mankind.