John 11:25-27 reads:

“Jesus said to her, ‘I am the resurrection and the life. The one who believes in Me, even if he dies, will live. Everyone who lives and believes in Me will never die — ever. Do you believe this?’ ‘Yes, Lord,” she told Him, ‘I believe You are the Messiah, the Son of God, who comes into the world.’”

Martha, in that moment, believed in Jesus and what He was saying. But just like with ‘trust falls,’ saying we believe something and acting out that belief are two different things.