Electricity is not a force either - and Magnetism

They are phenomena that can induce forces or effects upon other bodies

Foolosophy,

Pardon me, but you appear to be waffling. Whoever said that electricity and magnetism are *forces*?

Not only that, but if the curvature of spacetime exerts a force, then gravity exerts a real force. If gravity does not exert any real force on a body, then spacetime cannot be curved. And, if it is not curved, we better come up with a better explanation for how gravity actually works.

Well here's part of the problem. I assume we all agree on what classical forces are. In Newtonian mechanics (and including E&M), fundamental forces are actions-at-a-distance which cause acceleration according to F=ma. If you replace Newtonian mechanics with another model, you give up this idea of forces.

With general relativity, you basically keep the idea of the electromagnetic force being action at a distance, but replace the idea of gravity as a similar action with gravity as a change in geometry of space-time. Acceleration due to gravity is then modeled as motion along geodesics (the equivalent of straight lines). Would you still call that a force since it's modeled differently from electromagnetic force?

If you go to QM, then forces are described differently again--as exchanges of particles. But now you have a description of three fundamental forces in terms of particles, while gravity is still modeled in terms of geometry. Is it still a force if it's described completely differently from other forces?

I think it just boils down to semantics, since we know perfectly well how the model of gravity differs from the other forces in GR. If you call gravity a force, you're kind of lumping it together with the other forces, when it causes motion through completely a different model. If you don't call it a force, then you're left with the oddity that in the Newtonian description, it is a force, and causes motion just like any other force--so why is it unique?