The Bible underneath it
The God Who Sends the Lie
Scripture says God cannot lie. Scripture also shows him sending deception. Both are canon.
The point in one sentence
The Bible states flatly that God cannot lie, and the same Bible describes God sending a lying spirit, deceiving a prophet, and sending a powerful delusion so that people will believe a lie, in his own voice, in his own words.
The counter-texts first, because they are the claim
Numbers 23:19: "God is not human, that he should lie." Titus 1:2: God "does not lie." Hebrews 6:18: "it is impossible for God to lie." Hold those while reading what follows.
The texts
The lying spirit. 1 Kings 22: in a throne-room scene God asks "Who will entice Ahab?", approves a spirit’s plan to be "a deceiving spirit in the mouths of all his prophets," and sends it with the words "You will succeed." The prophet Micaiah narrates the whole arrangement: "the LORD has put a deceiving spirit in the mouths of all these prophets of yours."
The deceived prophet. Ezekiel 14:9, KJV: "if the prophet be deceived when he hath spoken a thing, I the LORD have deceived that prophet." The NIV softens the Hebrew to "enticed"; the grammar keeps God as the subject either way.
The sent delusion. 2 Thessalonians 2:11: "God sends them a powerful delusion so that they will believe the lie." Not permits. Sends.
The prophet’s own accusation. Jeremiah 20:7: "You deceived me, LORD, and I was deceived." The Hebrew verb ranges from persuade to deceive and translators disagree; say so when quoting it. But Jeremiah 4:10 uses the same charge for the nation: "how completely you have deceived this people... when the sword is at our throats." Neither accusation is corrected in the text.
Concede the defenses fairly
The standard reply is judicial: in every case the deceived party had already chosen against the truth, Ahab against the true prophets, the idolater of Ezekiel 14 with "idols in his heart," the people of 2 Thessalonians who "refused to love the truth." God, on this reading, ratifies a chosen path rather than corrupting an innocent one. That is a coherent theology and it is genuinely in the surrounding verses. What it costs is the plain meaning of the verbs: the texts do not say God stood back, they say he sent. A judge who plants false evidence on the guilty is still planting evidence.
It appears on nearly every skeptic list of these verses, and it does not belong there. "The god of this age has blinded the minds of unbelievers" refers to Satan, not God. Using it hands your reader a reason to dismiss the rest.
Why this should make you question
The problem is not that a deity is described managing kings through deception; that was ordinary in ancient literature. The problem is downstream: the same tradition asks you to stake everything on trusting what this being communicates, on the promise that he cannot lie, while its own canon shows the promise has documented exceptions whenever a judgment calls for one. A guarantee with exceptions decided by the guarantor is not a guarantee. And you have no independent way to check which category any given communication is in, including the one that says trust me.