[Charles H. (The_r0nin)]

If space/time is curved due to gravity then it is passive as it is being acted upon.

You have that backwards. Gravity is due to space-time curvature. The curvature of space-time might be due to mass, but the force of gravity is itself the "active" component of space-time curvature. This is why gravity curves the path of light when light has no mass for the gravity to act upon.

[freedom9]

"Gravity is due to space-time curvature."

So the apple falls due to space/time curature?