Christians help me with this one.?

Christians are starting to say that God is the Who and Why the universe was created and science is the how to understand it. Is this just another tactic of the people of the book trying to fit their fantasy beliefs into hard data to gain converts and keep the ones they have? If god is supernatural and can create miracles, ie. Raising of lazarus, parting a sea, pluage of frogs falling from the sky, then why does science exist? These things suppossedly happened with no scientific data to back them up. Why the different approach? One minute doing things out of thin air that cannot be explained (miracles), another leaving quantifiable data aroundto be studied and researched. Which is it? You can't have it both ways.