Literally, it says, “And they kinged My-Father-Is-King as king.” This emphasizes Abimelech’s infatuation with kingship. So Abimelech becomes an anti-judge prompted only by self-interest and designs on the monarchy. He is not called or appointed by God, and deity is marked in this narrative by his near-total absence.
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6 And all the leaders of Shechem came together, and all Beth-millo, and they went and made Abimelech king, by the oak of the pillar at Shechem.