I know I have distressed some very nice people with my previous comments on fundamentalism. I am sorry for pain caused. But one of my pet peeves is people who just make stuff up & then attack anyone who dares to challenge them.
There are many examples of religious intolerance, most of which is based on someone's limited ideas. A small recent example --- a preacher who declared the so-called rapture to be imminent a couple of weeks ago. Did anyone check the New Testament & Jesus' words??? He said explicitly no one would know when he would return --- that is NO ONE. On top of that, He never mentioned such a thing as a rapture.
It seems to me that studying the 1st century Christians, their writings, the life & teachings of Jesus & the Apostles' & Paul's writings-- that is actually fundamentalism. Taking some person's idea as if it were Gospel without critical analysis, leads a person into sidetracks. Even if the person is a nice person, if they go off on some tangent, I think it is wise to check it out carefully.
What did the 1st Christians believe, live, teach? That would be a place to start if one wants to be a fundamentalist.