Good businesses attempt, as much as possible, not to run on gut instinct or opinion. Instead, they try to be data-driven in as many aspects of the business as possible. Being data-driven can be difficult: as humans, we are strongly guided by our experiences, and the opinions those experiences help us to form. So even in ordinary, day-to-day, team-level thinking and decision-making, it’s important for us to step back and let data be our guide.
I can’t speak for other languages, but in American English we use the word believe a lot. I actually find it a little problematic, in part because I like to split hairs over words, but in part because the word is not specific enough.
For me, the word believe refers to something that I accept as a fact, even though I have no data, evidence, or other proof of it being true. Religion is something that involves belief, for example. There is nothing wrong with believing in something. However, even I tend to use the word more colloquially at times: “I believe it’s going to rain.” Technically, if I’m looking at a giant storm cloud and the barometer is falling, I don’t need to believe in the rain. I have some evidence that it’s coming.