I get that you feel like you have to "win" and that since facts and logic aren't on your side you want me to feel upset which would give you some sort of moral victory. You try and change the topic away from you claiming your own god (predestination) in response to an atheism comic no less, to debating my mental health which could put me on the defensive and begin to get under my skin like I have to you.
It doesn't work when you're so transparent though. And even if it had, you'd still walk away knowing that some stranger poked a few holes in the latest belief structure that you were trying to use to make sense of your reality. That would be a fun challenge to an intellectual but just sucks for someone like yourself who wants to be right and feel smug.
There's hope though. You don't have to stay like this. As you get older and mature, your awareness can help you to become someone who's interested in learning instead of being right. Then you could grow into a real intellectual thinker instead of cosplaying one.