The term “fatal flaw” denotes something introduced into an equation, concept or theory that produces an invalid result. When a scientist claims to believe the Bible but introduces evolution. or other non-biblical evidence that scientist has introduced a fatal flaw that renders an invalid argument. Be very careful when reading or listening to people who claim to be believers but introduce non-biblical evidence into their argument, they may be a wolf in sheep’s clothing… or they may simply be misguided by their teachers.