Firstly, well done for having a stab at it - that takes courage on an internet forum.
cofty has already highlighted the major flaw, but just to drive it home:
living creatures changed or evolved to survive
their genes were influenced by the cursed environment
Evolution doesn't do that. You're saying about 6000 years ago that all living creatures as soon as "the curse" struck concurrently changed their whole physiology, including their teeth, and these animals were able to survive and "evolve" at an equal rate without wiping each other out or dying of starvation? If evolution worked like that and so quickly, I would be pretty scared to walk out my front door, and if so, why aren't we seeing evolution like that today? Did God turn the dial up to 11 for a bit?
Also, if you're saying animals eating meat is all due to "the curse", your conclusion would mean there is no evidence of meat-eating animals from before 6000 years ago. Even for an old-earth creationist, that means the many fossils with meat-eating teeth and other features of carnivores are no older than about 6000 years? For example, it also means you're saying all those pretty obviously meat-eating dinosaurs were roaming the earth at the same time as Adam and Eve?
If you had gone with: "Satan put all the pointy-toothed fossils there to test us" that might have been a slightly more reasonable start.