Carl has summarized the issues very concisely and correctly. We will never have knowledge of ultimate reality completely, because of quantum uncertainty. The basis of our reality is on a side of a curtain beyond which we cannot see. If God is anywhere, he is there, concealed. And the human tendency is to be religious and to desire a humanized God, which cannot be guaranteed as the case. Whence 'the leap of faith' across a chasm of uncertainty.