There is a way of knowing God which the apostle Paul said is admittedly "beyond knowledge" (Eph. 3:17-19) (by which Paul meant intellectual knowledge), but it is still possible to comprehend God. It is not "scientific knowledge," but therein are the limits of science.
As a Jew I'm not prepared to argue extensively on Christian theology, but from reading that passage from St. Paul to the Ephesians, it does seem like Paul is saying that faith is an avenue to knowing that God loves you, that God exists. Paul does not say that faith allows you to understand God. Because thinking you understand God is blasphemous and anathema to all Western religious traditions.