I know you play 'devils advocate' lol, but i just think you're a little unfair to lump all Christians together. Like how there's a difference between a Wahhabist and a Shi.
Defending God's judgement isn't advocating for that to happen again. The Bible talks about the flood happening after every heart but Noah's turned black and evil. I wasn't there and neither were you. If God provided you mana from the skies, and you actually seen proof of God's existence, wouldn't you respect His wish to rest on one day a week? But even those that saw it, rebelled against his wishes, like when Moses smashed the first ten commandment tablet. And as I've said, selling yourself into slavery also happened when someone wanted to cover their debts.