What would christianity look like today if it had never been 'married' to the state?

How profound it is that our founders reversed the centuries-old tendency for the state and religion to marry.





But what if it had never had such a status? What would it look like today? Would it even exist? Or would it be closer to something like Buddhism?What would christianity look like today if it had never been 'married' to the state?
The world might have gotten religious freedom a thousand years early.