in GR, there is no gravitational field like there is in Newtonian gravity. Instead, stress-energy causes spacetime to curve (and the spacetime curvature tells matter how to move). There are forces between matter, and there is spacetime. In GR, there is no gravitational force, and this idea of spacetime curvature gives us Einstein's version of gravitation. So some object will both experience forces from other objects and the curvature of spacetime. So the motion of the object will be determined by the combination of both: forces from other objects and due to the curvature of spacetime. For example, a small charged object which is acted on by an electromagnetic force, and exists in a generally curved spacetime will have an equation of motion like this:
{d^2 x^\mu \over ds^2} =- \Gamma^\mu {}_{\alpha \beta}{d x^\alpha \over ds}{d x^\beta \over ds}\ +{q \over m} {F^{\mu \beta}} {d x^\alpha \over ds}{g_{\alpha \beta}}
So, the first term on the right hand side is due to the curvature of spacetime, and the second term is due to the electromagnetic force on the small object. Anyway, I hope this answered your question, I was not 100% certain what you meant about if I consider spacetime as fundamental as force.
