I looked up the passages in Job 40 and 41 that describe the Behemoth and Leviathon.
It seems pretty clear that the Behemoth is not an elephant or hippo, but a dinosaur like a brontosaurus. It had "bones like pipes of brass", "gristle like plates of iron", a "tail like a cedar." It was clearly huge. "He will drink up a river and not wonder."
The Leviathon sounds like a fishy dragon to me. "His body is like molten shields, shut close up with scales pressing up one another." "Out of his nostrils goeth smoke." "A flame cometh forth out of his mouth." It clearly has a neck, unlike the fish--"In his neck, strength shall dwell.' It couldn't be killed with arrows, spears, or slings.
From reading the scriptures, Job was familiar with both of these creatures either in his present time or from memory of a story passed onto him. In either case, it is clear that they were both created by God and the angels feared them.
The whole notion of dinosaurs, the way modern people understand, is something "discovered" in 1840. I think there was some mystery about it, even then.
IMO, the dinosaur issue is the last string for the "science proves God is a liar and therefore He doesn't exist" crowd.