On Purim, the salvation came about in what could easily be seen as a series of lucky coincidences: King Ahasuerus gets angry at his wife and selects Esther as queen in her place; Mordechai happens to overhear a plot to kill Ahasuerus and saves the king’s life; Haman happens to be “in the wrong place at the wrong time” just when Mordechai’s deed is being read to the sleepless king; Esther uses her position and influence to turn the king against Haman; and so on.
Reflecting this sequence of seemingly natural events, G‑d’s name is absent from the Megillah.