[PapaBear3625]

“And every species kind existing today was on that one Ark” [excerpt, corrected]

Fixed.

Central to creationist theory is that all species that either currently exist or have become extinct, were created during the Seven Days. So, either:

(1) every currently existing species was on the Ark, or

(2) there are species existing today that were not on the Ark.

If (2) is true, then that implies that new species were created after the Flood. Where and how did they come about?

“And we have no dinosaurs today because they didn't make it on the Ark.” [excerpt]

I don't know where you got that, but its not scriptural.

Dinosaurs existed. There is too much fossil evidence of their existence to deny that. Dino fossils have been discovered in the Middle East (where most of the Bible story occurs), yet dinos are never mentioned in scripture. Where did they go?

More to the point, WHY have we never found mammal or human fossils in the same geologic layers as dino fossils? Creation theory demands that they all existed at the same time.

[Fichori]

“Central to creationist theory is that all species that either currently exist or have become extinct, were created during the Seven Days.” [excerpt, bold emphasis mine]

That is a very popular strawman.

“Dinosaurs existed. There is too much fossil evidence of their existence to deny that. Dino fossils have been discovered in the Middle East (where most of the Bible story occurs), yet dinos are never mentioned in scripture.” [excerpt]

The scriptures (and the original English translations thereof) predate the word dinosaur.

“More to the point, WHY have we never found mammal or human fossils in the same geologic layers as dino fossils? Creation theory demands that they all existed at the same time.” [excerpt]

Your definition of 'Creation theory' is a strawman.

You are apparently ignoring what put those fossils in layers in the first place.