Isn't faith just believing without evidence?

That's a modern redefinition, not the biblical one. In Scripture, faith means trust - the kind you place in a person you have good reason to rely on, like trusting a surgeon or a friend. It's not pretending to know what you don't.

The New Testament constantly appeals to evidence: eyewitnesses, fulfilled prophecy, public miracles, and reasoned argument. Luke writes so his reader may have "certainty" (Luke 1:4); Paul reasons in the synagogues; Jesus points to what people have seen. Christianity invites investigation - "come and see." Faith and evidence aren't opposites; biblical faith is trust that rests on good reasons, then commits beyond what can be proven with mathematical certainty - which is how we live most of life anyway.