To say that every single avenue of discussion may be explored, except for one, is intellectual cowardice. Here's how the Christians tried to justify their view:
- Though God invented science, He can not be discovered through science.
- If scientific evidence were found that strongly suggested or even proved that God does not exist were discovered, it would be moot, as science can not explain God.
- God exists in another dimension outside of science.
If solid scientific evidence were discovered that proved God existed were uncovered, I strongly doubt that Christians would say, "that means nothing, as God is outside of science". Instead, they would be shouting it from the rooftops and claiming it as their own.
There is even money that can be awarded to scientists who work toward proving God exists. You can find that website here: http://www.templetonprize.org/