Sin
You said that God is almighty and knows everything. He rules over time and space. If all this applies then He must have realized the sinning from the beginning.

So why he offered the snake and the apple to Adam and Eve? He must have known that they will fail. He created them. He could have made them robust against sin. He could have made them that way that they dislike forbidden apples and don't want to talk with snakes.

But he did not. So the sin must have been an initial part of his design.

Punishment
If God already knew of his weak creatures and of the sin that will happen then he already knew that he will punish them with banning from paradise and with the flood and all that.

So why he designed us so weak to punish us? Is he an evil child? Does he like the punishments?
Very strange situation.