hmm
Well, it's quite simple why I believe in God, and at the same time I am very much in favor of science and the scientific method.
There is no natural explanation for the existence of the material universe. The big bang theory, for example, still doesn't explain how the first "bang" happened or where the energy or material came from in the first place.
When I think of God, I am thinking of a being, force, or condition that is supernatural; in other words, not within or of the material universe. Cause and effect would imply that something external to the material universe caused the material universe. Whatever that something is, I call God.
Of course, I have no information as to how anything supernatural came to exist, or even really how to describe any attributes of such things. So, we see the brick wall of both science and religion: neither one can explain things satisfactorily.
As to the religions man has made, which may or may not contain some accuracy regarding supernatural things, I remain very much a skeptic. I am not willing to completely write off the compiled thoughts of mankind over the ages, as that would be quite arrogant. But neither can I wholly buy into them; though I do accept such bits and pieces as seem relevant and beneficial.