If you want to define "Fundamentalist" to be something other than current real-world usage, that is fine. I'll just pick a new, less 'technical', word: Nuts.
If you are a creationist, you are an utter nut, full stop. A significant portion of Americans are religious nuts.
And, to clarify earlier discussion on the behalf of JabavuAdams, "Online, when someone writes "Christian", it's hard to tell whether they're referring to fundamentalists^Wreligious nuts, or not."
I define Christian Fundamentalist according to its actual usage within the relevant community [0]. If we were referencing Jewish, Muslim, or Hindu Fundamentalism the definition could be substantially different.
I have already proposed better terms: "literalist" and "dogmatist". Those terms may be insufficiently pejorative for your purposes, but here on Hacker News we have guidelines and cultural expectations against name-calling and incivility.
[0] note that I am not a member of the Fundamentalist, literalist, dogmatist, or creationist communities.
If you're interested in serious discussion, whether about religion, spiritualism, medicine (real or "alternative"), or any other topic, you should choose your terminology carefully and remain open to correction when others point out that you aren't using it right.
If you are a creationist, you are an utter nut, full stop. A significant portion of Americans are religious nuts.
And, to clarify earlier discussion on the behalf of JabavuAdams, "Online, when someone writes "Christian", it's hard to tell whether they're referring to fundamentalists^Wreligious nuts, or not."
All better?