1. Distinguish Two Methods
The scientific method records observations, forms hypotheses, makes predictions, conducts repeatable experiments, and analyzes results. But countless unrepeatable facts can't be discovered with the scientific method.
There's no scientific evidence that Caesar crossed the Rubicon in January of 49 BC, or that George Washington crossed the Delaware on December 25, 1776, or that Allied forces crossed the English Channel on June 6, 1944. Reasonable people believe these events to be true because they're verified by the historical method.