This may or may not just be mostly idealism.
I choose science over any supernatural interpretation of the world in the most part because it is evolving. I think humanity as a race is entirely too young to have something like a foreverstanding word of god. Science is still looking, still trying to answer the questions that we currently don't have answers to. Still evolving just like humanity. There may be things in this world that science will never truly ever be able to overcome or understand, but they are still searching for answers.
The purpose of science is both in pursuit of knowledge and the ultimate advancement of intelligent lifeforms. Even things that may ultimately turn out bad for the human race (Perhaps nuclear bombs, or maybe in a 100 years microwaves will be considered the worst thing to ever be invented) are advancements of the human race. Science is limited by the limitations of the current day and age, as science/technology advance or as humans advance the limits of science will be pushed forward. If humanity gets put back in the stone age, the ultimate limitations of science isn't limited, just the current limitations are.
As long as we push forward, we can always dream of anything.