God putting evil spirit
Do you know what happened here?
God had lost patience with King Ahab’s wickedness and wanted to remove him.

If you take a look at the text you can see that God is asking questions.

v. 20 “The Lord said, ‘Who will entice Ahab to go up and fall at Ramoth-gilead?’ And one said this while another said that.
v. 21 “Then a spirit came forward and stood before the Lord and said, ‘I will entice him.’
v. 22 “The Lord said to him, ‘How?’ And he said, ‘I will go out and be a deceiving spirit in the mouth of all his prophets.’ Then He said, ‘You are to entice him and also prevail. Go and do so.’
v. 23 “Now therefore, behold, the Lord has put a deceiving spirit in the mouth of all these your prophets; and the Lord has proclaimed disaster against you.”

No, God sending a deceiving spirit does not mean that he is a deceiver. He was merely sending a demonic force, allowing it to perform what was natural to it, to do something that was part of the greater plan of God. If I send my wife to the store to get something, I am not the one doing it — she is. If I know that in the process she is going to speed and break the law, am I the one guilty for her speeding? Of course not, since she is exercising her free choice.