According to wikipedia Dinosaurswere vertebrate animals that dominated terrestrial ecosystems for a period of 160 million years, first appearing on our planet about 220 million years ago, at the end of the Triassic. At the end of Cretaceous, now about 65 million years ago, dinosaurs suffered a catastrophic extinction caused by global climate change and Earth by a meteorite impact 40 km diameter giant Gulf of Mexico, called "Chicxulub", which concluded not only period of domination of the land by these animals, but even their existence.
If dinosaurs existed or not does not arise Sunbeam questioned because they have found fossils that prove their existence. The problem arises when it comes to hundreds of millions of years, and how this data is calculated. It is known that almost all world religions speak of a planetary cataclysm that took place thousands of years ago (potobul Noah). Science may well calculate that period by period, but before the x-time, no. Science is exceeded.
When dinosaurs lived? According to science: with 220,000 million years ago. According religions: a few thousand years ago. What to believe? Everyone decide personally.