Obviously I do, since I'm the one who said it.
Do I care if my car mechanic believes in ghosts?
Do you care if your electrician believes in Ohm's Law? Because that's what it means to deny evolution, for anyone whose job is even remotely connected to biological science. Your car mechanic analogy is irrelevant, because car mechanics don't confront decisions in their professional life that may bring them into conflict with their religion.
A better way to phrase your question might be, "Do you care if your car mechanic believes in phlogiston?" That would be "Yes."