and he had no idea of the General Relativity Theory, either.
"and he had no idea of the General Relativity Theory, either."
So what? You may not believe this, but the Theory of Relativity is actually a relatively minor refinement of the Newtonian model of the world. Newton's model, on the other hand, was a profound step forward -- arguable the greatest scientific advancement of all time.
Incidentally, I read years ago that Newton's model may have actually been more accurate than we realize. His force equation is usually written as F = m dv/dt, but he actually wrote it as F = d(mv)/dt, which may be more accurate and capture the relativistic effect. But I am not a physicist, so don't hold me to that.