Seeker, even evolutionists don't believe they existed BILLIONS of years ago, but rather, MILLIONS, and that they became extinct about 65 million years ago.
There is a group of scientists and Christians who are called YOUNG EARTH CREATIONISTS (YECs). Of course Evolutionists MOCK the idea that any legitimate scientist could be a creationist, but that doesn't change the fact that there are many degreed creationists.
The remains of dinosaurs are largely bones that have been mineralized and some mineralized eggs as well. This is what fossils are. There have also been many dinosaur footprints found as well as skin impressions. But YECs do not believe that dinosaurs lived so long in the past, but rather they believe that dinosaurs and humans were both created on the sixth day of the creation week and that they lived at the same time.
There are a number of websites that show from the Bible the evidences that they co-existed, and these websites point to observational science that supports this view. Creationists also have at their web sites arguments that point to the idea that historical records --written, oral, and pictorial-- that show that dinos were alive at the same time as humans.
In this forum and others, people will only trade jabs back and forth and make brief comments in an effort to make others look bad, and themselves look good. You have heard and heard and heard in all of your schooling the idea that the earth is very old, in the billions of years. This idea is echoed in movies, in literature, in science programs on TV, in advertizing, and in popular magazines. For once you might consider going to a Creationist source, like Answers in Genesis, and honestly looking over their presentation of the YEC position.