What you think doesn't matter even a little, because you have no say in the matter.
The Word of God says that if we transgress even a single point of the Law, we are responsible for breaking all of it. It's never just one sin, but just one is enough because God requires sinless perfection. Your grade is either 100% A+ or a big fat 'F' and there is no extra credit.
It also tells us that we all have sinned and have fallen short of the glory of God. That child needs to repent of his sin and trust in the finished work of Jesus to be forgiven and reconciled to God. It's by Him the child will be justified, or its by Him the child will be condemned.
You can seek to justify your own sin as "no big deal" all you want by these little ficticious stories, but it's all for nothing. You do have a judgment day coming, and if it's a single sin or many against you, it will not be well with you on that day.
He offers mercy and forgivness to whoever will come and take it. But you reject, and reject, and reject, and reject, and one day it will just simply be gone... and then it's too late.
We all need forgivness and the sinless perfection of Jesus, the spotless Lamb of God who was made sin for us who knew no sin, imputed to us, so we can stand on that day boldly, with not a single sin charged against us.