Would I believe you actually held that opinion if you gave it (without knowing anything else about you)? Sure. It’s not logically inconsistent, and contains no obvious tells that you are arguing the opposition. Do I think it’s a good argument? Not really.
The first thing would just be a personal hangup. As your own argument, that’s fine. But, as an opposition argument, it inherently implies that you think that we don’t like to argue, but most of us do have very strong positions and are willing to argue them. You leave out the idea that maybe we do like confrontation.
The second asks a rhetorical question. Why would you do it? That’s open to a bunch of reasons being presented. To actually argue why it’s bad, you’d need to argue why those reasons aren’t good. I argued, for example, that it doesn’t deepen my understanding of an argument, which is usually the reason it is presented as good for people to do. I also argued that it’s something only a professional might actually need, since anyone who needs opposition can just go find someone who really believes it.
The third is again recounting a personal issue: that you often believe things for only gut reasons, and don’t actually check into them to understand if your gut reaction is the right one. However, this time you argue it as merely a possibility, so this is your best argument.
The fourth seems incomplete. They should lose. But you left out “And, by arguing the opposition, I may help them win by mere repetition. Unless I debunk my own argument, I’m actually helping the side that I clearly believe is factually wrong.” And, hence, the argument does matter. If it didn’t matter, that’s when it wouldn’t matter if I gave an opposing argument.
And then I’d probably add to all of this: “So, since I don’t support this type of argument, I never really learned how to do it.” Though, to be fair, I should have included that at the end of my post above. Without it, I’ didn’t actually answer the question the OP asked!
Still, I admire you for trying, and realizing that only those who are on your opposition could possibly judge how good your argument is. I hope my judgment is helpful.