O God, who has power over all things, hear the voice of those who have been rendered hopeless, and save us from the hand of the evil-doers, and save me from my fear. (Esther 4:17z LXX).There are obviously two ways of looking at this situation. Either the Greek version is the original and the Hebrew version has deliberately removed references to God, or the Hebrew version is the original and the Greek version added the piety back in.
In the ancient world it is rare for anything to be written without reference to a god of some sort. The Hebrew version of Esther is an anomaly, and not just in the Hebrew Bible.