There's a certain breed of religious leader that is willing to make dogmatic pronouncements about the divine order. For example, Luther proclaimed justification by faith; Calvin, the doctrine of election; Pius XII, the bodily assumption of Mary into heaven.
And let's not leave out other traditionalist claims about Christianity. For example: God consists of not two, not four, but exactly three Persons. Jesus was God Himself. The authors of the Bible were protected from error by the Holy Spirit.
We should thank God for these ideas. They embody humanity's ceaseless hunger for explanation and understanding.
But the real-world data in support of these particular ideas — the evidence of what God in fact is, or has done, in these respects, as opposed to what we imagine he is or has done — is sketchy at best (to put it charitably).
Deuteronomy 18.22 explicitly counsels testing of prophetic ideas against real-world evidence: "If what a prophet proclaims in the name of the LORD does not take place or come true, that is a message the LORD has not spoken."
If that's not enough, we can usefully learn from recent controversies in the world of physics: NY Times science writer George Johnson reports that "new ideas, some physicists complain, are a dime a dozen. What they crave is new data, perhaps from the Large Hadron Collider scheduled to go online near Geneva next year. What is discovered there might do for physics what the COBE measurements did for cosmology in 1992: provide some long-needed reality testing." (Emphasis added.)
