Critical thinkers reject their claims of having truth or knowledge through faith. Of course, they use a different definition for both of those than the faith-based thinker.
Interesting how you only see bias in others. Yes, demonstration does equal truth. An idea doesn't deserve to be called truth, knowledge, correct, or fact if it can't be demonstrated to accurately describe and predict some aspect of reality.
Science is possible because nature is evident to the senses and exhibits regular patterns which are discernable, and knowledge of which can be used navigate life more successfully by accurately anticipating outcomes under various circumstances.
Easy peasy. Faith is insufficiently justified belief, a belief is any idea considered true by the believer, and knowledge is the collection of demonstrably correct ideas.
And for good reason. I don't call an idea religious unless it's unfalsifiable. There are other beliefs in religion, such as that one should tithe, but they're not religious beliefs, just beliefs about what's good for the religion. And the religions have discovered the value of discouraging theft, murder and lying, but that's known empirically, and why atheists know that as well.