Your solution is to believe nothing, then? That, in itself, would constitute a belief.
I believe the topic was zealotry but feel free to build a straw man
Actually, it is through the zealous that one knows a faith. And nothing compares so dramatically as the concept of “martyr” in the Catholic vs Islamic mindset.
As all zeal (no one’s excluded) can cross the line of truth, goodness and beauty, it is important to have a final “papal” authority imposing orthodoxy. Zeal rightly directed is a wonderful and blessed thing. I often thank God for “our” fanatics... for that’s what the likes of a St. Francis or a Don Bosco were to the ben pensanti of their age: nuisances. Upsetters.
I can't believe in anything 100%. Even the most concrete physical “laws” are likely only be true within the filter of our own minds. What we vehemently believe is true is probably not so in objective “reality”.
There is probably no “solution” and the deeper you dive into physics and objective reality research, the more you realize how little we know. All the words in our human languages would probably explain nothing.
I can't say I don't believe in God but I will never accept an 800,000 word book written in an ancient language and then altered by man for millenia as absolute truth. Even if all the secrets of the universe were suddenly transferred to someones mind today, they would not have the language to express it.