Dinosaurs. Dragons. Devils.
When Lucifer and his minions were cast out of Heaven, they were not sent to Hell (contrary to the popular culture image of Satan and his demons ruling over Hell.) They were sent to Earth:
And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, And prevailed not; neither was their place found any more in heaven. and the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him. - Revelation 12:7-9 KJV
Now, is it possible that these “dragons” who were cast down to Earth were in the form of dinosaurs/great lizards? After all, most Biblical descriptions of angels in Heaven do not describe handsome young men:
Cherubim:
And before the throne there was a sea of glass like unto crystal: and in the midst of the throne, and round about the throne, were four beasts full of eyes before and behind. And the first beast was like a lion, and the second beast like a calf, and the third beast had a face as a man, and the fourth beast was like a flying eagle. And the four beasts had each of them six wings about him; and they were full of eyes within: and they rest not day and night, saying, Holy, holy, holy, Lord God Almighty, which was, and is, and is to come. - Revelation 4:4-6 KJV
Seraphim:
In the year that king Uzziah died I saw also the Lord sitting upon a throne, high and lifted up, and his train filled the temple. Above it stood the seraphims: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly. - Isaiah 6:1-2 KJV
Since Lucifer and the demons were also angels, we can imagine that they had a similar fearsome appearance. Also, we can infer from Scriptural accounts of angels appearing in human form that angels are capable of altering their appearance. Is it unreasonable to suggest that Lucifer and his fallen angels appeared as dragons, or gigantic serpents on Earth?
Traditional descriptions of dragons frequently describe the creatures as ancient and also wise. “Serpent” is word that is often used interchangably with “dragon”. It makes sense that an angel (fallen or otherwise) would be ancient and wise. Therefore, I propose that the fallen angels did indeed take the form of, or inhabit the bodies of dinosaurs/dragons/serpents. Perhaps the “serpents” were intelligent beings who willingly allowed the fallen angels to inhabit them? Their presence on Earth must have been fairly common, and relatively un-noteworthy to humans. Certainly, there is no specific reference to dinosaurs in the creation account; this is insignificant, because there are countless other species that are not mentioned, too.
Note the account of the serpent tempting Eve:
Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden? And the woman said unto the serpent, We may eat of the fruit of the trees of the garden… - Genesis 3:1-2 KJV
There is no indication that Eve is the least bit surprised to encounter a talking serpent, which again leads me to believe that it was an unremarkable occurance in and of itself (and relates to my idea that the serpents were intelligent creatures who allowed the fallen angels to inhabit their bodies). People were well aware of these big talking serpents. (Note that the Bible does not call it a “snake”. The Devil being a snake in the story is a much later characterization.)
Then God curses the serpent:
And the LORD God said unto the serpent, Because thou hast done this, thou art cursed above all cattle, and above every beast of the field; upon thy belly shalt thou go, and dust shalt thou eat all the days of thy life Genesis 3:14 KJV
I can suggest from this that God was decreeing that serpents would no longer be these towering, powerful beasts. Rather, they would be small and relatively insignificant. “Upon thy belly shalt thou go” is a good figurative description of being shrunk from 20 feet high down to the size of a small dog. Perhaps this was God’s way of punishing the serpents for allowing themselves to be used by Satan. This may have been something that happened gradually with later generations of serpents/dragons/dinosaurs. Since the Flood was many generations later, the serpents were small enough that there was no problem getting them into the Ark. This would also explain the lack of dinosaur bones “…all jumbled together if there was a flood?” - the “serpents” were no longer huge by that time.
BTW - Maybe they are mentioned, though in a roundabout way:
All the kingdom of Og in Bashan, which reigned in Ashtaroth and in Edrei, who remained of the remnant of the giants: for these did Moses smite, and cast them out. - Joshua 13:12 KJV
There are several other references in the Bible to “giants” who lived in an earlier time (either a race of human giants, to which Goliath was a throwback, or else a reference to humans in general being much bigger in the early years). If there were “giant” people, might there not also have been “giant” animals?
Anyway, this is all just speculation in which I’ve engaged over the years, but I think it makes a certain amount of sense.