Ok, I see, it is your misunderstanding of the "establishment" clause that is the problem. What you are doing is trying to silence the majority of Americans who are still of faith. Sorry Charlie just because you don't like their reason doesn't mean it is invalid.
No one, including Davis, is establishing a religion.
There's no 'misunderstanding' of the Establishment Clause, or the Free Exercise Clause, for that matter – given the fact neither have anything to do with this case.
Indeed, there are no Free Exercise Clause issues in play, no religious liberty rights at stake, and no one is seeking to “silence the majority of Americans who are still of faith,” the notion is ridiculous, unfounded nonsense.
As already correctly noted: all persons of faith are free to worship as they see fit, absent any unwarranted interference by government.
And should a person of faith refuse to abide by a just, proper, and Constitutional court order – as did Kim Davis – then they can expect to be found in contempt of court, having nothing whatsoever to do with their faith.