Self-examination is indeed valuable, but it doesn't take Christianity to achieve it.
No, indeed. Of course anyone can undertake regular self examination, it doesn't need them to be a Christian. But there is one difference, I'd say. Nothing in the non-religious world encourages it as a matter of course. It is more a reaction to an event, say after an argument. When non-religious people do so as a regular matter of habit, it tends to be linked with something with lower-case-religious-overtones, like meditation.

Only my view, of course.

A brontosaurus? I thought you would have gone for an Apatosaurus (especially as it translates to 'deceitful lizard', I believe *smile*)