Why do we need Gravitons?

If gravity is the curvature of space-time then how can it ever be described by a quantum theory. If it is a graviton field then it is not the curvature of space-time but the interaction of the graviton force particles. Maybe i need to reread Three roads to quantum gravity. I don't understand it. They say it's one thing and then it's something else.

Wouldn't it be better to describe a quantum theory of gravity as some kind of space-time atoms that interact on the quantum scale? If there is a quantum foam of space at quantum scales a better description for me would be a scaffolding of space-time geometries that are built up to create classical space-time.

Maybe the density of the quantum foam is not high enough to constitute a classical non-quantum space-time at quantum distances and only on larger scales do the effects of those space-time interactions build up to construct the world we live in. I've never read anything like this. If someone could help me understand or point me in the right direction it would be greatly appreciated.

Im just a lay person. I can't understand math so please no equations. And if it's something that can only be descibed mathematicaly ok.