In which way is telling a child that, if they do something wrong, they will likely suffer, abuse?
I think deliberate obtuseness seems to be the order of your day. The concept of hell, as you know perfectly well, relates to suffering (of some sort - people make this ghastly nonsense up as they go along so they can adjust it according to their own personal level of sadism) after death with no possibility of cessation.
If you don't consider that abusive - to adults, never mind children - then clearly your moral compass is knackered and is in dire need of repair.