I watched the first half of the first Ghost Rider and left. Too many Satanic elements, regardless of my feelings about the Morg. I would definitely not see it or take children.
Depends on what your definition of little is. Do you mean a preschooler or a preteen? Preteens could probably handle it. The others would probably have nightmares.
The Ghost Rider story is based on a man who is the child of the devil (doesn't know it). It has some very scary images, such as a man who, when his super-satan powers activate, ends up with a flaming skull for a head. I wouldn't take a little child to see it.
I would enjoy it though. I loved the Ghost Rider comic books. :)