Re: Christianity cannot be trusted with any power or authority.
To have a better understanding of establishment of religion you should read Memorial and Remonstrance
It does not have to mean a State Church. You really ought to familiarise yourself with the relevant history - and it doesn’t get much more relevant than this.
Re: Madison's treatise against state support for Christianity
I note that you still manage to miss both my point and Madison’s.
Madison was protesting against a bill which would see Christian ministers - except for Quakers or Menonists - supported by tax monies raised by the state government.
And this was considered - by Madison - to be an establishment of religion.