Comment 6 by BloodywombatTSI :

I also wonder, even if you accept that there's a reason God includes the rest of nature with all of this suffering, why did God design mechanisms in nature that would presumably have to have been there before sin? It's incredibly difficult to imagine a lion laying with lambs. If you remove the predator and prey attributes of each creature, they no longer are what they are. So before sin, a lion couldn't have existed, which makes the whole premise absurd.

If they do have an answer to my question here, like for example, "sin caused these traits to appear", they're giving sin a mechanism for the creation of complexities they claim evolution is supposedly incapable of and can't explain. Why don't they just accept that it's evolution and not sin?

Even if they give that insufficient explanation though, it still doesn't answer how a lion would still be a lion before sin.