By breaking with the sin of his father, he shall surely live. But we did not break away from the sin of the first parents, Adam and Eve, when we were babies. We have not done what is right. We have not personally avoid what is evil. Keeping the Law does not start from knowing the Law first.
Ignorance is no defence.
Even our physical law, such as the law of gravity, has no regard of prior knowledge. A person will drop dead, get crashed, if he jumps from a 100 storey building, falls straight down and hit the hard ground. His ignorance of science, the physical law does not afford him any reason to live. There is no bargain. Those who do not keep the Old Covenant shall die in such iniquity as offending the Law.