God knows that all will fail to be perfect. We know it too. No one ever claims that they are perfect and deserve heaven. They only declare that they are “good” and that God needs to cut them some slack.
It is our nature. I have read the Institutes and am familiar with that section. By knowing that all will fall short and be condemned, God does effectively predestine all to go to hell except for those who he chooses to rescue by predestining that they go to heaven.
I will remain Calvinist. It is the only consistent theology. And if I am wrong, well, I was “good” and God will certainly cut me some slack.
But you know what? If the non-Calvinist is wrong, it doesn’t matter either since God will still predestine that they will go one way or the other upon death. The good news is that another very important doctrine of Calvinism is that a person can only be concerned about this if their heart is regenerated and that means that they were predestined to salvation.
So, when an Arminian is preaching about the evils of Calvinism because he cares about Jesus and the souls of the world, well he can care because God chose for him to care.
The only practical difference between Calvinism and the alternative in the earthly life of a Christian is that the Calvinist understands why it is ok to stop evangelizing to a person who cannot hear.
And if anyone will not receive you or listen to your words, shake off the dust from your feet when you leave that house or town. (Matt 10:14 ESV)
If God absolutely predestines us to heaven or hell, then why bother with church, religion, the bible, anything.
There is nothing you can do about it.
Besides that, everything in the bible is a useless lie. The moral code given by God is useless. If God predestined you to hell, no amount of righteous living will save you.
If God predestined you to heaven, no amount of sin will condemn you.
Pure, true Calvinism is theologically bankrupt. And I don’t know why you would even argue that, because it won’t matter.
Comforting, that.