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...
If gravity is...
geometry then it SHOULD affect all masses in the same way.
Ok. I'll bite. *Why* is this assertion true? What experimental evidence
can confirm it for *all* possible situations? (Not just for gravity.) How
could this assertion be falsified experimentally? What does it mean to say
"gravity is geometry"?
Are electric and magnetic fields also "only
geometry? What other things in *physics* are "only geometry" and therefore
conform to this assertion for the same reason? What is the criterion for
judging whether a thing is only geometry, or is something more?
Is it
possible that we might be clever enough someday to show that *everything*
is geometry (properly interpreted)? Leave aside the obvious fact that math
is not physics and physics is not math. I assume you are speaking of
geometry not as a branch of pure math, but in its historical sense as a
"science of measurement" and in its modern sense as a science which
describes the metric of space.