Not entirely true tbh, mavity can be explained by the natural force of exertion evident in celestial objects. Einstein's Theory of General Relativity has an overwhelming amount of observable evidence. String Theory goes on to state why large objects demonstrate gravitation, but that starts going really deep and into parallel universes.
It has yet to explain how particles have mass. I was simply making a point, you cannot dismiss God from a mechanism when we cannot explain that mechanism fully.