There I cannot agree with you. Just because a theoritician has proposed a particle called a "graviton," does not mean it exists. We have never observed one, have no idea of how to obseve one, nor do we have any theory as how a "graviton" can work at stellar distances.
All measurements of gravity is in some way "calculated" whether by an analog device such as the stretching or bending of a spring or by the finding of a zero point by trial and error of a balance scale. None of them measure gravity directly, they merely measure its effects.
Until we can find your graviton and describe how it works, I doubt we will be able to directly measure it.
Einstein proposed that gravity is a multi-dimensional bending of space-time relating to the presence of mass.
Forces in general are difficult to discuss in layman’s terms, and I don’t happen to have an advanced degree in general relativity.
The claim was made that gravity “...is no more detectable than God is and in no other way than God would be.”
This is nonsense. Whatever gravity is, it is detectable, measurable, quantifiable, consistent, predictable and all the other ables that make a phenomenon accessible to science.