God used this witch to bring up Samuel to warn Saul. God can do that you know.
1Chr 10:13: "So Saul died for his transgression which he committed against the LORD, even against the word of the LORD, which he kept not, and also for asking counsel of one that had a familiar spirit, to enquire of it;"
You just implicated that God used forbidden and sinful practices, that God Himself forbid.
Exo 22:18: "Thou shalt not suffer a witch to live."
Deu 18:10: "There shall not be found among you any one that maketh his son or his daughter to pass through the fire, or that useth divination, or an observer of times, or an enchanter, or a witch,"
1Sam 15:23: "For rebellion is as the sin of witchcraft, and stubbornness is as iniquity and idolatry. Because thou hast rejected the word of the LORD, he hath also rejected thee from being king."
Gal 5:20: "Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,"
Etc.
1Sam 28:6: "And when Saul enquired of the LORD, the LORD answered him not, neither by dreams, nor by Urim, nor by prophets."
God refused to answer by the right conduits, what makes you think God used the witch?
Saul knew God wasn't talking to him anymore. He didn't seek God:
1Sam 28:7: "Then said Saul unto his servants, Seek me a woman that hath a familiar spirit, that I may go to her, and enquire of her. And his servants said to him, Behold, there is a woman that hath a familiar spirit at Endor."
Lev 19:31: "Regard not them that have familiar spirits, neither seek after wizards, to be defiled by them: I am the LORD your God."
You are greatly self deceived.