We are something, we appear to be form within flow, that's a map, is it reality, ehh close enough. And if that close enough lets you successfully interact with reality it's a good map, no? And if the map no longer serves you or it hinders your ability to interact with reality the map either changes or gets discarded. As long as your map, your delusion, lets you interact with reality in a meaningful way it is a good map. First you have to have faith in that reality you make maps of with your brain. Once you have that, you have a foundation that's unshakable, you can build as tall as you want as long as your foundation is reality. That's why the tower of babble fell, it wasn't built on the foundation of god, of ultimate reality, but the map being mistaken as reality.