By fundamentalism, I don't mean a view of Christian orthodoxy. Surely I am a fundamentalist when it comes to believing in God and that the Bible is His inerrant Word. I mean an attitude of must-have outcomes that distorts logic and decision-making.
In the Christian world, that attitude informs a political activism that, ironically, has a teeny weeny aspect in common with the Taliban--fusion of church and state. That way, the government can "make sure" we are behaving morally. The desire for a Christian state, misplaced in my view, emanates from "must-have-outcome" thinking. For many reasons, I, probably like you, am not for that kind of state. I want to inspire, not require, morality.
I think Paul would say that secular progressives are "religous in every way." They are addicted to must-have outcomes: you must be a fool to be anything but anti-war; you must commit to "diversity" or you are uneducated/unenlightened; you must believe in corporate conspiracy theories or you are "pro-rich" and "anti-poor." The list can go on.
I would suggest that the only must-have outcome we should embrace is this: to fear God and keep his commandments; and this, in our own personal lives--let's inspire it and not worry about requiring it.