Well theoretically (relating to doctrine) the extinction of the dinosaurs (this may be arguable) happened due to the war that raged between Lucifer (Satan) when he rebelled and the third of the angels he took with him, and God and the angels of Heaven. Since Satan was cast down to earth (and became the God of this earth) he could have easily destroyed the dinosaurs himself, to spite God or for whatever other reasons. Or it could have happened during the war. That's one way of looking at it. It makes sense. I don't care enough about it though.