When a religious person says they "believe" something, it means they operate as if it were true even though they have no evidence to indicate it as such (a.k.a. the god of the gaps).
When a scientist says they "believe" something, it means all evidence gathered so far indicates that it is true, but if more data comes in and a different conclusion is drawn, then the belief should be abandoned.
These are two entirely different concepts, but in English we tend to just say "believe". The scientific "belief" is more akin to a mathematical theorem: - if X, then Y - All data indicates X is probably true, so for now I believe Y. - New data indicates X is probably false, so I no longer believe Y.
And of course when you're engineering something, it's not that simple because you need contingencies. X may have a 99% chance of being true, but you still need to have a plan for for that 1% case.
None of this is something that religion considers whatsoever; with religion, a belief is true and anything contrary to that belief is considered false, even if that thing is a measurement of reality itself. There are still huge swaths of people who believe a person thousands of years ago was immaculately conceived, walked on water, turned water into wine, all things that you and I know are inconsistent with reality. But all contrary evidence simply doesn't matter, the "belief" remains. This is the antithesis of science.