Our Lord destroys the armies of Israel’s enemies in the Gog/Magag war to reveal that it was he and not the IDF that causes their defeat. Then He causes a great delusion to come over the people during the tribulation so that they receive the anti-Christ. Why do you think that is ?
The purpose of the Lord’s intervention in the Ezekiel 38 battle is to re-awaken Israel as a nation and fulfill His promises to them through the final 7 years of their 490 year plan (Daniel 9:24-27). The purpose of the great delusion in 2 Thes. 2:11 is to assist unbelieving individuals in following their choice to its ultimate conclusion.
2 Thes. 2:10-12 says the people perish because they refused to love the truth and be saved. Having done so, their only other option is to follow the anti-Christ to destruction. The key word here is “refused”. By their refusal to accept the truth (Jesus), they will have chosen to accept the lie (anti-Christ), and God will assist them in getting what they want.