to be real is to be found in objective reality, whereas minds are found only in brains
Minds (and ideas) fit my definition of real (and physical as I define it below). They manifest in time and space and affect and are affected by other real objects and processes.
The mind is not material otherwise your solution to Cartesian mind/ matter dualism would be mind-numbingly simplistic.
Matter is only one manifestation of the substance of reality. Energy and force are others. Altogether with space and time, these are basic elements of physical reality, which is why physicalism (or naturalism) is a better description of the philosophy also called materialism. We see the problem with that in this thread. Mind isn't material, but may well be physical.
I don't even really understand what it is exactly that you refer to with "scientific materialism".
I think you know how philosophers use the term (neutral, descriptive), but in these discussions, the phrase is often meant derogatorily by those who want to assert the transcendence of a god - a mind - over physical reality.
Believers have some ulterior motive about this issue. Notice they don't go on about how other processes are immaterial, only how the brain functions. We also see believers trying to separate what we call the mind from brains, much like they want to separate consciousness from living brains. Why this obsession?
Yes, bingo. And I think your last question is rhetorical. If mind is an epiphenomenon of matter, where does that leave creator gods that are disembodied minds? It makes them derivative of matter rather than its author.
The problem with your assertion is that the mind transcends the brain in scope and purpose. Yet you are trying to define the mind as subservient to the brain. It's the fundamental failure of materialism.
Here's another claim of a problem, failure, or crisis with no problem described. There is no failure of materialism and no success for idealism, and that's the crisis, problem, and failure of materialism, but for the believer, not the critical thinker.
You say, "but the brain comes first!", yet it actually does not. The value of cognition comes first, and the brain developed in response to it. The brain would not even exist but for the cognition that it enables to occur.
Brains preceded consciousness in evolution, meaning they conferred a selective advantage in those creatures that had them before cognition. There is no value of cognition except to the cognizant, and that sense of value is an intuition generated by the brains as well. Your thinking is teleological - purpose-oriented. You seem to see mind as the reason brains evolved, as if the future were shaping matter into brains in order to manifest as minds. Maybe, but we have no evidence that reality works that way, meaning that that idea isn't useful now and maybe never.
What appears to be the case is that matter arranged itself into brains naturalistically that then produced minds capable of holding ideas and some able to think in language (symbolically). One such idea is that mind is not derivative of or dependent on matter.
Your insistence that the brain is the essential component (because it's physical), and the mind is happenstantial is just plain wrong. And it's why philosophical materialism was rejected long ago by actual philosophers
Here's that tendency to prioritize mind over matter and a false claim about philosophy and philosophers. This is how faith motivates thought.