I'll let Voltaire, Diderot and the writers of the US constitution know they were fundamentalists too. I'm sure they'll be as amused as I am.

Your attempts at framing and rhetoric are getting very obvious.

which leaves the religious groups free to be as fundamental as they please.

Providing their actions aren't criminal, and they don't try to influence the state for their own exclusive benefit. That's where their freedoms end.

I hope I don't need to add that this principle shouldn't apply exclusively to religious influence, but to any behind-the-scenes influence on policy by vested interests for their own exclusive benefit.

The 'exclusive benefit' point is the crucial one.