That is a very interesting question & quote...and I thank you for posing the question.
First & foremost, my brother, I believe we need to clearly communicate the idea that Fundamentalists are not Christians; they are a cult all their own.
We must not argue with them but lovingly live out Christian calling in dependency to Christ praying for direction, guidance, courage, & love to maintain our call to love.
Unfortunately, it doesn't require faith to be a fundamentalist; its fanaticism & I believe we need to stop confusing Christianity & Fundamentalism.
It has to be considered one of the greatest irony as a Fundamentalist’s absolutism is the very opposite of faith. Fundamentalists have no questions; only answers.
Fundamentalists do not have faith; they traded it for absolute, heartless conviction.
Fundamentalists are certain that they possess the Truth (Capital 'T') & this certainty quickly devolves into dogmatism & a self-righteousness; which solidifies into a sense of Pride in being so very right.
Unfortunately, Fundamentalists have found the perfect antidote to thought. They know everything there is to know & that they & they alone are right.
Fundamentalism, in my opinion, is an ideal refuge from the demands of real faith.
We have to recognize as Christians that true faith has no easy answers. It’s difficult & stubborn. It involves an ongoing struggle; a continual questioning of our beliefs; a continuous wrestling with issues & ideas and most important a total dependency on Christ.
And yet we, the vast & all too quiet silent majority have ceded the public arena to this extremist minority.
We need to effectively communicate the true tenets of Christianity; reaching out to a lost world with the Love of God in Christ. We need to live out the Christian life in the strength of Christ being known by & for our love & our faith.