Interestingly, believing in God alone didn't cut it. It's explicitly the fear of eternal damnation that ultimately scares us into not being such gaping assholes and working earnestly toward a brighter future for everyone.
Of course, nothing is actually stopping you from being a decent, hardworking banker or whatever without believing in hell. The problem is that when you look at the big picture, it simply isn't in our nature to give a fuck about more than a handful of people or their money.
So it takes the threat of being boiled alive in their own urine to make a few corporate heads stop and rethink their strategy of embezzling and Ponzi schemes. Which starts to make a lot more sense given that so many CEOs are ...