Surely Abraham didn’t always respond to visitors as he did to God’s visit, with 2 others. So was this an instance where God’s manifest presence was so obviously extra-human, like in The Man Who Was Thursday, that Abraham knew something was up? Did he know he was God or just someone worth respect?
Any questions of their guest’s divinity must have been settled when Sarah’s internal laughter was called out. It’s interesting that she was rebuked for her doubt, given it was internal. The sin that lives in my mind often gets a free pass, but here Sarah’s nailed for the attitude that she doesn’t even give word to.
Where’s Sarah’s doubt was so silent that only God could have known, Abraham’s opposition to Sodom’s planned destruction could not have been more clear. He physically blocked God from leaving, challenged his reasoning then had the tenacity (or audacity?) to bargain with him for the fate of a city. Given his previously displayed affection for Lot, chasing after his rescue at the expense of foreign armies, I’m not surprised. But then again, he must recognize how fully dependant on God he is for everything he has and open resistance had to have been uncomfortable for the pragmatic wanderer.
He must have walked away sure he’d saved the city when God agreed to spare Sodom and Gomorrah for the sake on only ten faithful. Sadly, even our lowest expectations are often too high.