Here's my Creationist explanation about dinosaurs:
I believe God created all that is (not only listed things, but every last thing).
And that means God created physics and chemistry too. And they work great. Because they are His design, His creation. Therefore any evolution that happened (however much or little guided, with many or with few interventions) before modern humans would be God's design, if He is the Creator, as I believe.
But dangerous dinosaurs would not have been compatible with villages, woman and children, fields of crops that could be trampled or eaten, farm animals as attractive prey.
Imagine for a minute that powerful predatory dinosaurs were still around 3000 years ago, before we had modern weapons. Would spears and arrows be able to fight off a pack of Velociraptors? Or their larger cousins? Guard against a Pterodactyl snatching sheep and children? No.
God removed them. It appears very much like He removed them -- made most dinosaurs into compost very suddenly -- with a large asteroid.
One that was very literally just the right size.
Not too small -- if that asteroid had been 30% smaller, most dinosaurs would still be around during the days of the first men.
Not too large -- too many good species, necessary and helpful plants and such, would have been destroyed if the asteroid had been 50% bigger...
No, that asteroid that hit Earth was just precisely the right size.
For our sakes.
And it looks convincingly in layers of rock that it hit about 66 million years ago. In that case, we can then see it means time passed between days of creation. So it makes sense to me that the special days Moses saw in the vision from God were each one spaced apart in time from the next.
I don't need convoluted theories to reconcile creation and science. Instead, read the scripture as it is --
and if you do, then
Scripture fits perfectly with the Earth being very old, much older than Adam by far.
We can see an old Earth even in chapter 1 with a literal reading, by realizing that of course time would have passed during verse 1, an unspecified amount of time, before verse 2.
That some unknown amount of time passed during verse 1, as God created the Universe and then Earth -- time passage during this phase -- is just what anyone might expect or think likely that did not have a previous viewpoint to defend. It's even the most straightforward reading of the text.
The scripture could have been revealed to Moses differently (but it was not)... it could have instead been different if God chose and we could imagine a whole different verse 1, not like God did tell Moses, which might read (imagined) "God created the Heavens (Universe) in an instant, like the blink of an eye" if that were the case. But it's not there, not in the text, and we have no reason to add it in or assume it.