There is actually evidence of dinosaurs in the Bible.

Leviathan in the Bible is used as a reference for sea dinosaurs.

Job 41:1
Canst thou draw out leviathan with an hook? or his tongue with a cord which thou lettest down?


Psalm 74:14
Thou brakest the heads of leviathan in pieces, and gavest him to be meat to the people inhabiting the wilderness.


Psalm 104:26
There go the ships: there is that leviathan, whom thou hast made to play therein.


Isaiah 27:1
In that day the LORD with his sore and great and strong sword shall punish leviathan the piercing serpent, even leviathan that crooked serpent; and he shall slay the dragon that is in the sea.

Some dinosaurs would also be present on Noah's Ark.

Genesis 7:2
Of every clean beast thou shalt take to thee by sevens, the male and his female: and of beasts that are not clean by two, the male and his female.

So some dinosaurs would have been present on the Ark. It is likely that they were hunted after they came off the Ark, and may have died out because of this.