That quote is self-contradictory since it itself is a belief that "believing as little as possible is better than believing something". It itself automatically precludes anyone who holds to it from believing many things.

We can't escape belief. There will always be things in our lives that we will accept based on trust of some kind.

But (to get back to the post), as the author said, it can still be absolutely fine to not necessarily have an answer all the time. To realize this can be very freeing.