In context, he seems to be talking about fundamentalists as a term for extremists. That is, not someone who has a fundamentalist view of the scriptures, but someone who takes the scriptures as justification to commit violence. Also, in context, he is not isolating Christians, but making a broad statement about extremists of all stripes, including secular extremists.
have you read about all the people who get kicked out of churches that espouse his teachings because they have a fundamentalist view of Scripture?