I'm not sure it's misquoted: "I contemplate with sovereign reverence that act of the whole American people which declared that their legislature should 'make no law respecting an establishment of religion, or prohibiting the free exercise thereof,' thus building a wall of separation between Church & State."
This was during his presidency as well, and is often considered the basic effect of the first amendment. If the founding fathers felt like the country should maintain christian roots, why did they immediately create an amendment preventing it?
z6joker9 wrote: