First of all, that's simply not true. There are some oddball people who believe this, that's for sure, but it's not part of the dogma of any religion I know of.
Secondly, and more importantly, sorry for jumping on you like I did. I realized when I thought back on this conversation that this is a weird sore spot for me because of something that happened a long time ago that apparently I never got over:
{Note: this is where the apology ends and a story not necessarily of interest to anyone but myself begins; feel free to stop reading, really, even in the middle of this sentence because I know I have a tendency sometimes to rattle on and on without ever--uh, sorry…}
Shortly after I became a Christian, I was talking with a friend of mine about why I was a Christian, and what I thought the importance of Christianity was. In the middle of the conversation, he blurted out, "Okay, but what about dinosaurs?" I actually proceeded to explain to him the various points-of-view that many Christians have about dinosaurs, that not all Christians were "young-earth creationists", and even among those that are, there are some who believe that dinosaurs are mentioned in the book of Job.
But I realized after the conversation (and it's stuck with me all these years) that "Okay, but what about dinosaurs?" was a completely stupid question that had nothing to do with what we had been talking about, and he had used it to derail the conversation. The proper response from me should have been, "I don't know; what about dinosaurs? I'm pretty sure they're extinct, so I'm not sure what they have to do with anyone's beliefs about God and the afterlife who doesn't happen to live in the Mesozoic Era."