There is nothing new under the sun. There's early evidence for questioning God's word in the garden of Eden, still doesn't make it right even a little bit. This whole point is completely irrelevant it gets you nowhere. If we as individuals reject the concrete meaning of words such as all then pretty soon we're talking past each other with completely different languages that sound the same.
Arminians reject eternal security though. So what does that have to do with any of the scripture I brought up? Calvinist and arminians are both wrong and a total false dichotomy.
Now you're confusing foreknowledge with actively preventing belief which is what hardening is. Also, I'm pretty sure the Pharaoh wasn't an unborn child when God said this. There's good reason to believe by this point he was quite possibly reprobate or a good way towards it. And we know that he hardened his own heart first early on, we can account that to the Pharaoh himself.
You would like to lay all the blame for sin at the feet of God, but Jeremiah 19:5 clearly demonstrates that he is not the author of sin, as I have said before.
They have built also the high places of Baal, to burn their sons with fire for burnt offerings unto Baal, which I commanded not, nor spake it, neither came it into my mind: - Jeremiah 19:5
This still doesn't remove accountability to Pharaoh for his sins. This was pharaoh being recompensed for his own actions and God used it to magnify his own glory in the process. This doesn't remove accountability.
Therefore hearken unto me, ye men of understanding: far be it from God, that he should do wickedness; and from the Almighty, that he should commit iniquity.
For the work of a man shall he render unto him, and cause every man to find according to his ways. - Job 34:10-11
No it doesn't. Only by your tragically ill-conceived logic. Also 2 Peter 2:1 specifically states that reprobates are denying the Lord that bought them.
Now you're the one limiting God. You just said he can't find a way to get to his stated end without authoring people to sin. So you just blamed God for every sin and disobedience and aquitted every person of it, while also limiting the capability of God by saying some things are beyond him. The actual truth of scripture far exceeds that view:
But as for you, ye thought evil against me; but God meant it unto good, to bring to pass, as it is this day, to save much people alive. - Genesis 50:20
This doesn't mean God is the author of sin though. What part of that do you not get?