Most people mistakenly believe that Einstein's Theory of Relativity effectively replaced Newtonian Physics, but Einstein simply updated the Newtonian concept to include new knowledge of subatomic physics.
Einstein built on Newton's work, he didn't replace it or make it obsolete although that's what atheist science trolls (ASTs), scientifically illiterate science worshipers (SISWs) and SciPop devotees believe.
Physical laws describe broad classes of observations. They're a summary of what we know. They don't define the universe, they're defined by the universe.
Newton's bold guess was that gravity is a property of mass. However, the proportional relationship between mass and gravity only measures the observed effect of gravity, it doesn't reveal its cause.
As odd as this may sound the Bible contains an extensively developed doctrine of gravity. It includes the nature of the soul, a core accretion model of planet formation and the plan of redemption.
The attractive force of a body which we can measure isn't a property of the body itself, it's imparted to it because it's in a gravitational field. This leads to a new definition for gravity which is axiomatic.