Fundamentalism has gotten a bad rap. The “fundamentalism” that requires a Muslim terrorist to blow himself up in order to kill others and thereby reach Islam [1]’s paradise is not the “fundamentalism” that causes a Christian to obey the teachings of Jesus Christ and stand upon biblical principles. The issue is truth. Anyone is free to disagree with biblical Christianity, but it is unreasonable to dismiss it as “fundamentalism.” One would have to prove that the fundamentals taught by Jesus Christ and throughout the Bible are erroneous before they could be dismissed.
Links:
[1] https://www.thebereancall.org/taxonomy/term/50/islam