200 years you say? Then exactly how did states within the union charge church taxes after the signing of the Constitution(Massachusetts until the 1850s REQUIRED 5% tax), how did the requirement of state constitutions for elected officials to believe in 'Almighty God' pass muster(some still in effect as late as 1987 challenged in court)? The only, and I mean the ONLY instance you see is the letter by Jefferson drudged up time and time again and rebutted time and time again. The issue Jefferson was addressing was between denominations of the Christian faith. Many were concerned that Danbury Baptists were being unfairly physically attacked by COE members within Virginia. But several states did have official churches legally and Constitutionally. Only after 1867 and the illegally passed 14th Amendment did this become the issue of which you speak.
So no, it has not been 200 years and as much as you try to revise history, it still doesn't change the facts