The original poster asked if it was a sin. Well, it has been given much forethought, and other posters have given forewarning.
If the original owners had abandoned the cat by dumping it in the park, I’m guessing the OP would be horrified. So why is it different if the OP does it?
Even
Elsa was trained before being set free. This proposal is to put out a living being like putting out the trash.
This is a
PET. It may have been fixed, and might even be declawed. If it doesn’t know how to hunt, how is it supposed to learn? By reading a book on the subject?
Dumping it in a park means exposing it to an even worse environment than it has now. People might poison it, beat it to death, or who knows what. And starvation is an incredibly long, slow, way to die. So is freezing to death, which takes all those uncounted days of struggling not to freeze.
And its suffering will serve no purpose. It will not understand why it was treated this way.
Yes, Animal Control may have the cat euthanized. But they don’t do it to be cruel. It’s their interpretation of good stewardship: to prevent suffering. If animal control were cruel, they’d be dumping animals in the park themselves.
I’ve hated myself for turning in a stray to the shelter. Technically, I still do. But the stray was old; the weather was brutal, and it was desperate. You could hate yourself no matter what you do. So why not do the right thing?