Why do some Christians insist that the Earth is only 6000 years old?

Do they not watch natural history programmes on TV ? Are they living in a fantasy world and just denying proven science ( yes it has been proven that the earth is millions of years old ) just because it says so in their bible ? And what about the dinosaurs ? They lived for many many years before humans so why does... show more Do they not watch natural history programmes on TV ? Are they living in a fantasy world and just denying proven science ( yes it has been proven that the earth is millions of years old ) just because it says so in their bible ? And what about the dinosaurs ? They lived for many many years before humans so why does it not mention all those dinosaurs in the bible ?

Are these Christians delusional ?

Or are they right ? If so how ?
Or is the creation story metaphorical because nobody alive at the time it was written knew about dinosaurs or how the world was created.
Update: Oh and science has also proven that prehistoric man was also around millions of years ago, you know the ones we evolved from , right ?
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