"Find me any competent scientist who doesn't believe in gravity. I'll be waiting."
Gravity is a force. It exists. Everyone believes that gravity exists. That isn't even a question.
Within limits, some mathematical formulae can be used to predict gravitational effects. The ones Newton came up with work OK, but only from the frame of reference of this planet. Once you head out into the universe, gravity behaves much differently.
The question, mlcnnnn, is how does gravity work? You know, we have no real explanation for it. The theory of gravity has changed drastically since Newton. Yet, we still don't know exactly why gravity works as it does. There are hypotheses about it, and research is ongoing.
So, there's lots of disagreement about the theory of gravity. Gravity's effects, like evolution, are facts. They happen. Why and how...well, that's all still under study, and probably will be long past our lifetimes.
Bad example, mlcnnnn.
TOE is still just a theory. Prove to me humans descended from ape-like creatures. Now drop something. Hmmm.