So, basically nothing from movies can stop a bullet. It's probably reasonable to extrapolate from this that a Bible neatly placed over the heart also doesn't stop a bullet (damn you, Sleepy Hollow, you lie).
Oh well, they're movies. They also want you to believe Nicolas Cage can have a normal conversation with another human. Plus, we can take solace knowing that the well-worn cliché of grabbing another person to block incoming bullets would actually work. So... yay?