Yet God does not have to ask to forgive us. He can just do it.
Sin is connected to law. We would not know about a particular sin until the law says, "thou shall not do X". Forgiveness of sin makes law void, since law involves punishment for violation. If one's sins are forgiven in advance, there is no longer law, because law loses it teeth.
For example, if one breaks the speed limit and the Police Officer that pulls you over decides to forgive your violation with a warning and nothing more happens; forgiveness of sin, we get the same end result as they're being no speeding law that day on that road.
When Jesus died for our sins, it cames down to our own choice whether one still accepts law or not. Law is still with us. We still have to pay taxes and cannot drive over the speed limit, even though we have the forgiveness of sins. Law is no longer due to God, due to forgiveness of sin. It is now exclusively due to man, who are not as forgiven, when you violate their law. One will no longer go to hell for breaking the speed limit. But man can punish you, by stealing some of your money, in the name of their law.
A distinction was made, between the Children of the Bond Woman and the Children of the Promise. The children of the Bond Woman are like children of slaves who has no choice but to follow orders. The Children of the Promise, are like children of God who are not under law, since God has already forgiven them in advance, like an indulgent parent.
Law is connected to the tree of knowledge of good and evil, which was the tree of Satan. God did not tell humans to choose Law and knowledge of good and evil. There was a taboo in place. Humans choose that for themselves, with the coaxing of Satan. Law is not from God, but from Satan. However, humans thought law was from God, even though God told them not to do it this way.
Forgiveness of sin was there to reassure humans there was a better way that God had in mind for Adam and Eve, before they decided to serve Satan and Law. This is why Jesus is often called the second Adam. Jesus places us at the crossroads of Eden, once again, able over come original sin by our own choice. History shows that most humans, when given the same choices as Adam and Eve, still chose Satan and law, once again. Old habits were hard to break.
This may have to do with genetics and human selection, that involved humans choosing law over thousands of years. Violation of law would given selective disadvantages; pain and death. This pattern of selective behavior has become genetically innate, but we still have will and choice. But most people follow the easy path of innate; children of slaves who have to follow orders out of fear.
If you owned a slave, you can play God. You can make unjust laws and they have to obey. You can be abusive in the name of your own owner-slave world. This may also be why law was maintained by man even with the forgiveness of sin. Abusive people liked playing God via law. Forgiveness of sin meant even the slaves were forgiven, making the abusive people lose some power. Those who make the most laws are the most abusive since this leads to the most violations and the most punishment and abuse. They get to micromanage you like a slave.