There's many flavors of Christian.
What is a Christian?
You might get many answers; Look what happens here - many versions, interpretations.
A person may self-identify as a follower of Christ; but others may no deem it valid.
If you made "Christianity" the State religion, I guarantee there'd be 50 K new versions of Christianity, the next day.
They were all colonists and supposedly all the same religion, but couldn't live together as one - because of the disagreements as to interpretation of scripture.
The fights over Scripture is what supposedly (according to his own account) turned Alexander Aleister Crowley to Satanism. He hated the Christians for all their pettiness; according to his own explanation. His father was a Brethren preacher.
That's why our common ground as Patriot Americans is freedom of thought, rather than coercion? Or should be?