This happened to my husband as well. He is not known to admit his own mistakes, though he has no problem pointing out the mistakes of others.
I think we can all be accused of this. He believes firmly in what he believes scripture says, just as your hubby does, as well as SFIC does. As has been proven by various threads throughout the years, all of us believe what we believe and are not easily swayed to change our thought or even to admit we might be wrong.