Currently the two most winningest head coaches ever fired in NFL history are:
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Marty Schottenheimer from the 2006 Chargers. Career 47-33, 0.588
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Tony Dungy from the 2001 Buccaneers. Career 54-36, 0.600
Sean McDermott is now career 68-41, 0.624, including being 6-6 at the moment.
Firing him now would set the NFL record for most winningest HC ever fired.
It depends on the locker room. If the team still has faith, you’re likely right. But if Josh Allen or notable captains demand his ouster, then all bets are off.
Personally I don’t know how any player can have faith in him.