I often hear people claim that children are not accountable for sin. Some people say that there is an age of accountability, not because Scriptures say so, but just because it just must be. Others state it in a more-sophisticated way, saying that a person can only be held accountable for what he understands to be sin, on the supposed basis of Romans 4:15 (while ignoring Romans 2:15). And others claim that children are innocent (not comparatively, but absolutely).
However, not only does Scripture not exempt any class of people from accountability for sin, from conception until death, but rather it makes explicit statements regarding the universality of sin.
The first such statement is in Genesis 8:21: "I will never again curse the ground because of man, for the intention of man’s heart is evil from his youth." This is the statement by God after the Flood that He will never again judge the world in that way. Why? Was it because sin had been eliminated? No, it was because the elimination of sin would require the elimination of mankind, "from his youth." God here explicitly states His perfect judgment that there is no such exemption on the basis of age or mental sophistication.
God says one thing but human sentiment insists on the opposite. Why? Because human sentiment is part of that very sin nature!
WSC Question 15
3 hours ago