They're not really married to God, they're more like...um..his daughters? I think. Usually God don't support marriage between more than two people.

[ With Christians, no matter which kinds, that's generally the way it is. Mormons are different, he knows, but then the US laws gets in the way of that. And maybe there are other branches with supported (encouraged, even) polygamy as well. ]

And they are still not allowed to do anything they want. There are laws that even they have to follow.