in the scientists that came before. As long as the science is repeatable, it is placed as a theory. There is so much science out there that at some point we must have faith that they have done their homework.
Did you believe your math teachers when they gave you the pythagorean theorum? Of course. Why? Because with numerous tests and practical applications it has proven itself. Does an apple keep falling if we drop it? Yes, then a thing called gravity is proven. Do organisms change do to mutation of the genes? Yes, so a thing called evolution is proven.
Saying, "Miracle," is a way to describe something science has not been able to describe yet. As most things, it is just a matter of time, ie.. steam engine, airplane, DNA, genetic engineering, etc..
If you do not believe in the theory's behind the applications that help people everyday, how can you believe in a God that is supposedly personal yet never stops tragedy?