Why gravitational force is still an interesting phenomenon/subject for the world of science?

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Many scientists DO NOT believe that gravity is a force at all, since they cannot detect any energy transfer or other mechanisms that act between separate objects under each other’s gravitational influence. Most scientists believe that for one body to act on another body from a distance requires an exchange of energy. While no such exchange has been identified, scientists have theorized and tried to find what they call gravity waves.
Einstein theorized that the total curvature of space time is split into two components: (1) the curvature of space and (2) time dilation. Einstein theorized that both components are responsible for gravity. According to Einstein, time is modified by mass so it runs slower near large bodies of mass and the dilation of space-time creates the illusion of gravity. Einstein explained that space-time is bent so it appears that an object is being moved by some "force of attraction" between the two objects of mass. Most scientists today accept that gravity is a phenomenon whereby large masses curve space and time within their vicinity. While there has been some experimental data that support parts of Einstein’s theory.
But some scientists cannot accept the concept that space-time is curved. In fact, much empirical evidence supports the contrary; thus, most scientists either force-fit everything into general relativity, while a few scientists continue to grope for other theories that might explain the root cause of gravity.

If gravitation is a force of attraction, then what are the causes responsible for it?

• How mass causes gravity?
• What is the interchange vehicle that propagates gravity?
• Why gravity appears to propagate instantaneously?
• Why gravity appears to wrap or bend space-time but does not?

If gravitation is just a space- time curvature and not a force applied between two objects, as sir Einstein said, then:

• Why and how physical existing mass can bend non-physically existing space-time?

Newton was puzzled that the root cause of gravity was beyond the reach of science. Newton was convinced “that there were causes hitherto unknown”. Newton said:
“That one body may act upon another at a distance through a vacuum without the mediation of anything else, by and through which their action and force may be conveyed from one another, is to me so great an absurdity that, I believe, no man who has in philosophic matters a competent faculty of thinking could ever fall into it."

Great scientists: Newton and Einstein.
(Two theories with different logic, but almost same result……amazing.)
Einstein’s theory was used to explain how objects could affect each other at a distance, but it was not able to explain exactly how matter could curve space any more than the discovery of the Law of Universal Gravitation enabled Newton to explain his “force” of gravity. Einstein theorized the existence of gravity waves, which have never been discovered directly so far.
Crucial experiments that justified the adoption of General Relativity over Newtonian gravity were: the deflection of light rays by the Sun, and the precession of the orbit of Mercury, and gravitational red shift. Einstein’s theory of general relativity was able to explain those phenomenon better than Newton’s. General relativity was able to explain why Mercury's precession differs from Newtonian prediction. Einstein explained that since Mercury is the closest planet to the sun it moves faster than any other planet, and orbits the sun in space that is much more “curved” than the space near any of the other planets. This curved space affects the orbit of Mercury and Einstein’s calculations predict this behavior more accurately than Newton’s, but still with some error.
General Relativity also was more accurate that Newton’s in predicting the bending of light rays as they pass near the sun, because the Newtonian deflection of the ray corresponds only to the time dilation. Einstein’s formula also takes into account the relative curvature of space. Thus, Einstein’s calculated total deflection is twice as big as its Newtonian prediction. Experiments later validated that the observed deflection of light near the sun was more in line with Einstein’s predictions and within the observational error. General relativity also explains the equivalence of gravitational, inertial, and centrifugal acceleration (the equivalency principle).

Nikola Tesla challenged Albert Einstein's theory of relativity:
(One of the scientist who had not accepted the logic ‘space-time curvature’)
Announcing he was working on a Dynamic theory of gravity, which he began in 1892. Tesla believed that gravity is the result of the field of force surrounding all matter. He stated:

“Only the existence of a field of force can account for the motions of the bodies as observed, and its assumption dispenses with space curvature. All literature on this subject is futile and destined to oblivion. So are all attempts to explain the workings of the universe without recognizing the existence of the ether and the indispensable function it plays in the phenomena ...”

Regarding Einstein’s theory of curved space, Tesla chided:

• [The Dynamic theory of gravity] ... explains the causes and motions of heavenly bodies under it's influence so satisfactory that it will put to an end idle speculation and false conception, as that of curved space ...

On his 81st birthday on July 10, 1937 Tesla published a statement critiquing Albert Einstein's theory of relativity. The following is a portion of that statement:

• ... Supposing that the bodies act upon the surrounding space causing curving of the same, it appears to my simple mind that the curved spaces must react on the bodies, and producing the opposite effects, straightening out the curves. Since action and reaction are coexistent, it follows that the supposed curvature of space is entirely impossible - But even if it existed it would not explain the motions of the bodies as observed. Only the existence of a field of force can account for the motions of the bodies as observed, and its assumption dispenses with space curvature. All literature on this subject is futile and destined to oblivion. So are all attempts to explain the workings of the universe without recognizing the existence of the ether and the indispensable function it plays in the phenomena...

While Tesla asserted that he had "worked out a dynamic theory of gravity" that he would soon give to the world, he revealed few details about his theory and died before publicizing any details.

A truth: Sir Einstein would have never ever thought in his life that his theory of relativity will achieve the highest level of success and achievements than any other theory.

• “When Einstein introduced general relativity, it was rejected as contrary to known Newtonian physics, unsupportable and unverified. Now, general relativity is the accepted dogma of physics and appears as well entrenched as Newton’s theory was. But that was not the case in the 1920s”