I think it was Anselm who said "I understand because I believe."
You mean Anselm of Canterbury, 1033-1109? Good current source, I guess.
The revealed word of God DOES, however, give certainty.
Yes indeed, it does indeed do that. Regardless of whether that word is right or wrong, it does indeed still give you absolute certainty. Regardless of whether your own fallible human misunderstanding of that "word of God" is right or wrong, it does indeed still give you absolute certainty.
And you have repeatedly demonstrated that here on this forum. You have repeatedly been completely and absolutely wrong about so many things, but because of your absolute certainty of "The revealed word of God" as uniquely misunderstood by you, a fallible human, you have been able to withstand any and all facts and even reality itself. Such is the power of religious certainty.
Certainty does not mean that you are right. All it means is that you refuse to examine your own faulty assumptions and that you refuse to test or verify your own faulty assumptions and that you refuse to deal with reality. As we all have witnessed you do far too many times on this forum.
Such certainty is no virtue, nor any strength. It is nothing more than a feeble denial of reality.
You claim that your beliefs alone give you understanding. But if your beliefs only lead you into denial of all reality, then it leaves you understanding nothing at all.
OK, so your false certainty misleads you into a false sense of understanding. But in stark contrast to that self-delusion, "bleak reason" provides us the tools to seek the truth and to actually understand.