Unbelievable Stories in the Bible: Why are there so many stories in the Bible that don't seem true, such as, Samson's strength in his hair, 900 yr-old-men, giants, etc.? Why don't we see documented miracles today? [Psalm 90:10, John 12:29]. Proving Christianity is True: With all the religions in the world, how can one be sure and prove that Christianity is true?