Christianity evolves with humanity. That's why different denominations believe different things. it's also why we don't stone people to death any more.
In this instance the parish priest stepped in and told the principal to accept the child. The PRIEST. He's fairly across the teachings of the bible (old and new testament) and the doctrine of the Catholic church and he still thought the little child should be allowed to attend the school.
I think he did exactly what Jesus would have done.