As @iNow point's this is two different questions:
1/ The advantage of God's starts by trying to teach children the advantages of not taking more than they need, for instance, we need to chop down tree's to build our home's so we create a God of the tree's that we thank for providing our home's, but will be angered if we take a tree that we don't need and will strike down in some way that is fearful; when we forget that lesson we get Easter Island
2/ The advantages of religiosity, started because someone has a good idea that makes sense (at the time) and works to make thing's better for most people, it spreads because of that and the powerful teaching tool that's God.
The problem we have now is that we 'know' there's no god of the tree's, is the, so called, sofistication of the 'science' of politics; the Trump's of this world are very good at making a specious idea seem like it's good and it spreads through all the children that know there's no bogie man to make them think twice.