Why did God divide the people of Babel?

[ElDinero]

Kind of makes God look like a bit of a fucking idiot really, doesn't it G-C? Since he would presumably have been aware of the fact that after a while, the tower would have reached the Earth's atmosphere and they wouldn't have been able to go any further. Of course, this would be long after they experienced freezing conditions far, far lower down, so they'd never find that out in the first place. God would surely know there was nothing to worry about, no? It's almost like the people who wrote it didn't know about any of that stuff, isn't it?