This attitude is common among religious believers who face accusations that the reason their beliefs require faith is because there is otherwise no good reason to believe them.
The cold hard fact is that ALL knowledge is uncertain. We can't know anything for sure, because all our sources of knowledge are suspect. The experiences we have might all be illusions. Things that seem obviously self-evident might only seem so because our brains are broken (or otherwise lying to us). We have no means, even in theory, to arrive at knowledge that is absolutely, indisputably, and obviously true.
It gives the word "knowledge" a somewhat weaker definition than we would like. But that's what we've got to work with.
The real difference between religious teachings and scientific models is that religious teachings are based on some person-or-group who claims to have had a special experience or be a special kind of person and as such has access to knowledge that nobody else does. And so we should believe just because they said so. Scientific models, on the other hand, are based on repeated observations that have been attested-to by many people under very rigorous testing conditions. Neither has absolute proof, but science has "a whole bunch of us saw this and still see it every time we look" whereas religion has "people long ago wrote this down and there is no way to test it now."
Religious belief tends to be bolder, giving answers to more questions that we would like answered. Science tends to be more conservative, admitting to its limits and only answering the questions that it can answer from the data. So, religious answers are often more marketable. But they still come from more dubious sources.
And that's why religious beliefs require "more faith" than scientific models, even though scientific models can be really hard to understand.