(In response to: Were there stegosaurs (Stegosaurus, Kentrosaurus, etc.) in the biblical Garden of Eden?)

Very unlikely.

The dinosaurs were probably long dead before Adam and Eve came on the scene.

Unlike humans, animals are allowed to either diversify and/or go extinct as the situation occurs. The fossil record shows that all life forms came into existence in very sudden bursts. After that, they largely remain the same with the exception of diversifying within their kind until they eventually go extinct.

This pattern is, interestingly, the exact opposite of what one would expect from an evolutionary standpoint, and precisely what one would expect if they believed in a special creation by an intelligent designer.