That's a new one to me.
You wrote:
“Latin was blessed of God?”
Its usage in the Church most certainly was. I could be in New York or Japan or Argentina or Rome or Nigeria or Bombay and I would have been able to fully participate with ease in the Mass when it was in Latin.
Depends on what you mean by blessed. Why do you suppose God choose a time when Israel was a Roman province for the birth of His Son? Why do you suppose He sent His chosen leader of His Church to Rome?