It would be interesting to see a discussion of Dr. Carson's positions on the issues. Yes, he's religious, well educated, articulate, and thoughtful. Which of these qualities makes him "unqualified" exactly? I was under the impression that the Constitution specifies whether or not a person is qualified, and by my reading of that document, the qualifications for the office of president are quite simple; a presidential candidate must be (1) a natural born citizen of the United States, (2) a resident for 14 years, and (3) 35 years of age or older. So with this list of requirements, I am unaware of any candidate running for the office of president who would be considered "unqualified", be they black or not.
What you are describing is what makes one "eligible" to be president, not what makes them "qualified".