The scientific method applied to God was not looked upon favorably in those times (or many thereafter). The specific reason in the Bible that Jesus did not throw himself down from the cliff or turn stones into bread was to not "test God." Therefore any miraculous evidence would probably constitute a test. The situation is like Omega appearing and offering tantalizing amounts of utility if only a complicated (but tractable) hypothetical situation is correctly solved, with the additional condition that using rational thought processes causes immediate failure.

In fact, I should probably post a detailed description of FBDT (Faith-Based Decision Theory) that beats the pants off of TDT and other rational decision theories.