Let's look at your argument:
- God demands perfection of us.
- Perfection is impossible.
- Therefore God demands the impossible ("Ought" does not imply "can").
As I've pointed out numerous times, the problem is that you give absolutely no justification for premise (2). Why would anyone believe premise (2), especially given premise (1)? You have no case.
Let's move on to look at some of the implications of denying that "ought" implies "can." Here are some of the things that someone who denies the principle must count as just:
- Fly to the moon without any help from technology or you will be executed.
- (To a newborn infant): walk across the room or you will be severely punished.
- Make 2+2=5 or your hands will be cut off.
- Achieve the impossible or you will be eternally damned.
Now anyone with some common sense has a ready reply to these claims:
- This is unjust. Humans can't fly to the moon without any help from technology. It is unjust to punish someone for failing to do what is impossible.
- But newborn infants can't walk, or even understand your command!
- But I can't make 2+2=5!
- But "ought" implies "can." If something is impossible, then it can't be commanded (i.e. contrapositive).
The Calvinist quickly rejects such "excuses," pointing out that they rely on the wholly false principle that "ought" implies "can." "I never asked whether you could do such a thing, I just told you to do it!" He believes God is just, even though he demands the impossible and punishes eternally for failing to do it. It is downright scary to think what the Calvinist parent who truly takes his doctrine to heart is capable of--he would punish his children for failing to do the impossible without batting an eye.
You are good at saying things, but you are bad at giving arguments for the things you say. Is the Calvinist god a monster? I think it is undeniable that he is.
- Anyone who sends someone to eternal damnation for failing to do the impossible is a monster.
- The Calvinist god sends people to eternal damnation for failing to do the impossible.
- Therefore the Calvinist god is a monster.
There is nothing uninformed about this. There is no mischaracterization of Reformed theology. There is just the logical conclusion of a very poor theological system.