Congress shall not forbid the free exercise of religion. Freely exercising legislates nothing. Anything which gets out of hand can be handily handled at the poles.
Preferably at the south pole. That's farther away.
Seriously, the whole reason behind claiming we are a "Christian nation" is to impose the likes and dislikes of Christians on everyone.
What if "everyone" doesn't want to play along?
(Remember The Enlightenment?)
Forgive him, Caesar — he is a barbarian and considers that the customs of his tribe are the laws of nature. G.B. Shaw,
Caesar and Cleopatra
Religious belief does not constitute scientific evidence, nor does it convey scientific knowledge.