Faith is not just a belief it’s also based on evidence. This could be of history, archaeology evidence or other scientific evidences.

Knowing is interesting part to it. There’s the intellect which comes from thinking deeply about topics. But then there is intuition which comes from gut. Sometimes known as a gut feeling or man’s second brain. The guy lining is filled with neurons as well.

Using your intuition you can know things without needing to use your intectllect to articulate you thoughts.

There’s countless of examples successful people who openly discuss relying on their gut feeling to make big decisions.

Overtime from your own personal life experience you start to gather a 6th sense of what is good and bad for you using your intuition.

It’s a form of knowledge as well imo.