There's plenty of controversy regarding the theory of gravity. It cannot be reconciled with quantum mechanics. What's the force law on scales of distances less than 0.1 mm? Where are the gravitons? There are in fact more controversies surrounding the theory of gravity than there are evolution. Note that the theory of gravity is something very different from the LAW of gravity, which is solely descriptive, not explanatory. If we were to talk analogously about a LAW of evolution, we would have to say it's something like that the genetic makeup of species changes over time, and that would be completely non-controversial.
Also, of course stating that there are gaps in the theory of gravity lends no support for the "alternate theory" that God pushes everything together.