Causality and is not only the basis for modern (and in some cases ancient) science, but it is also a limit. I think Polkinghorne says something like this, but don't quote me, Science and faith are like two sides of a coin. Since faith is approaches reality with the question "why?" rather than sciences "how?" it can never answer sciences "How?" question, much like science can never answer Religion's question of ultimate "why?"
The Official John Polkinghorne Website