If we do discover a complete theory it should be in time understandable in broad principle by everyone. Then we shall all philosophers scientists and just ordinary people be able to take part in the discussion of why we and the universe exist.
To have faith is to believe in truth believe that truth confers special power on those lucky enough to get a little insight and to know in our hearts that all these things come from God which is why we should never get too cocky about our successes.