They should be able to describe the Motions of objects in various mediums without depending on any gravity.....

The things you are talking about are trivial/easy.

How do you measure mass

You can’t measure things that don’t exist in reality. You can calculate them, however. Mass is merely the intrinsic weight of an object (weight minus the buoyant force).

These equations must exist

They do. But the existence of an equation proves nothing about reality.

if Gravity exists......then space time curves

Not according to newton, no.

so light follows the curve

There are no demonstrable examples of this in reality. Lights path can only be altered by direct interaction with matter.

needs more math

Math worship is a scourge. When discussing science, I prefer english (as did most all other scientists in the history of the discipline).

We should be able to devise a volumetric test which will be able to be used to discern a curve over large distances

This is an interesting idea. Even if just for the thought exercise, you should further flesh it out / refine it. Perhaps share it on the community I created to discuss such things?