The main issue with church and state combining is that in our current multicultural nations there are numerous religions and only the majority religion will make the rules (look at Saudi or iran for what that turns into). If the religious right ni the US keeps going, i can see the US turning into a similar state in due time, though I reckon you'd have certain states secceeding.
The US political system handles the religious cauldron that exists here just fine. I have no reason to believe that this ability would change with more of a mix of religions.
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