The correct option is A. he broke down the altar of Baal. Detailed Explanation:

1. Context of Gideon's Story: Gideon, a significant figure in the Book of Judges in the Old Testament, was chosen by God to deliver the Israelites from the oppression of the Midianites. His story is pivotal in understanding the themes of faith, obedience, and divine intervention in Israel's history.
2. The Name "Jerubbaal": The name "Jerubbaal" is significant because it reflects Gideon's actions and his relationship with the Canaanite god Baal. The name itself can be translated to mean "Let Baal contend" or "Baal will contend." This name was given to him after he destroyed the altar of Baal, which was a major act of defiance against the worship of false gods in Israel.
3. The Act of Breaking Down the Altar: In Judges 6:25-32, God commanded Gideon to tear down his father's altar to Baal and cut down the Asherah pole beside it. Gideon obeyed this command, albeit at night to avoid being seen, as he feared the repercussions from his community. This act was crucial because it demonstrated Gideon's commitment to God and his rejection of idolatry, which was rampant among the Israelites at that time.
4. Significance of the Name: After Gideon destroyed the altar, the townspeople were furious and demanded that he be put to death. However, Gideon's father defended him by arguing that if Baal was truly a god, he could defend himself against Gideon. This defense further solidified Gideon's new name, as it symbolized his challenge to Baal's power and the beginning of a movement to return Israel to the worship of Yahweh.

Why the Other Options are Incorrect:

• B. he defeated the Midianites: While Gideon did indeed defeat the Midianites, this event occurred later in his story and is not the reason he was called Jerubbaal. The name specifically relates to his actions against Baal, not his military victories.
• C. he sacrificed to Baal: This option is incorrect because Gideon did not sacrifice to Baal; rather, he actively opposed Baal worship. His actions were aimed at dismantling the worship of Baal, not participating in it.
• D. his father's name was Baal: This option is misleading. Gideon's father was named Joash, not Baal. While Joash had an altar to Baal, the name Jerubbaal does not derive from his father's name but from Gideon's actions against Baal.

Summary of Key Points:

• Gideon was called Jerubbaal because he broke down the altar of Baal, symbolizing his rejection of idolatry.
• The name means "Let Baal contend," reflecting his challenge to the worship of false gods.
• Gideon's actions were a pivotal moment in Israel's return to the worship of Yahweh.
• The other options do not accurately reflect the reason behind Gideon's name change, focusing instead on unrelated events or incorrect information.

This thorough understanding of Gideon's story and the significance of his name will help you grasp the broader themes of faith and obedience in the context of Christian Religious Studies.