Christians belief in dinosaurs?

Ok, when I really got into Christianity and taking Genesis into mind, I immediately didn't believe in dinosaurs. But, I was thinking, is it possible that humans and dinosaurs co-existed on earth together and when God made the flood happen, this wiped out the dinosaurs? Please state your opinion, this is mostly for Christians but atheists can answer too but, please no rude remarks. If you think this is totally not true what so ever than please state why and also atheists, i know you don't believe in God and the Bible but, you have a opinion to share then share it but just no, "God doesn't exist', or "The Bible is fake". Just state what you think on it. Thank you in advance.