But there is NO Physicist now alive who believes that Newtonian mechanics is fundamentally correct.They still teach it at the colleges. I talked to a professor at the local college (because I wanted to know if he taught a class on quantum.) that didn't believe in Quantum physics at all!
If it's now considered bunk, then why the heck are students still forced to take it and pay for it?
Well, having taught Physics to undergrads for a number of years, the answer is this: on the ordinary scale of things useful for a very large part of physics, chemistry, biology, weak gravity astonomy, telemetry, and almost all of engineering that isn't EE, Newtonian Mechanics works perfectly well. It is an amazingly accurate approximation; the conceptualization is
much simpler, and the mathematics is an order of magnitude or so easier. On these scales, for these professions, there is no reason to teach quantum mechanics, so it is not taught except for those aspects particular to a given discipline.
I don't know what your local college is, but there is no mainstream Physicist who doesn't believe in QM. None.