HP, I don't relish arguing a point of view with which I don't agree. So let's call it carrying to a logical conclusion a view with which I differ.
Regarding foreknowledge (which non-Cals define as foreseeing): As I understand it, God looks into the future, sees HP, exercise repentance and faith for salvation at some point in time. On that basis, God elects HP, and saves him in time.
Seems to me that HP, who was lost , then chose to accept Christ, he has made a contrary choice. Seems to me that HP's salvation is a certainty. Unless one is prepared to argue that sometime between the time God foresaw HP's faith, there was a possibility that HP would change his mind. Or change his mind several times back and forth. Thus one can lose his salvation?
It doesn't appear to be a question of the power of contrary choice. He choice was made. Now that the choice has been made (to repent and believe), will he later choose otherwise, thus reverting to being lost?
If that's right, then I imagine this scenario, God speaking. "Oh, look, Son, HP just repented of his sins and trusted you for his salvation way out there in the future. Put him on the elected list, and write his name down in your book. Oops, I just foresaw him change his mind. Never mind. Wait a minute, he's back."
This is the logical result of your argument against necessity/certainty/inevitability.
Now, maybe we simply have a semantic disagreement. Maybe if we simply said that what God foresees, will happen (not can, not must, not certainly, not inevitably, simply will happen), we could skip a lot of our conversation.
To clarify further, I do not believe God saves anyone against his will. I have read this argument from some who ought to know better. That God forces his will on people who don't want to be saved and saves them anyway. And that God sends to hell people who really want to be saved, and have faith, and God says naw, you're not one of the elect.
No one is dragged kicking and screaming into the kingdom. You will never find anyone who would say, "I'm saved, but I didn't want to be. I don't even like God but he saved me against my will."
That's silly, you say, and you're right.
Now I do not want to misrepresent your view, so I'll rely on you to correct me.