In addition to Victor’s thoughtful comment, I recommend Derek Rishmawy on writing off fundamentalists (emphasis added):
And yet, I can’t help but note this as an example of the care that needs to be taken when we move to quickly write others off as “fundamentalists”, or even liberals, or heretics. Speaking to my own wing of the family, I can think of conservatives who are a little quick to apply the “heretic” card to their Trinitarian, supernaturalist, resurrection-affirming counterparts with whom they disagree on important, but less central issues. If we’re not careful, we can fall into the trap of so polarizing ourselves against the tribe we disagree with, we can’t even bring ourselves to admit we worship the same Savior. And that’s just sad.
Read. The. Whole. Thing.