Not at all. Just because a theory is taught in a graduate theology program does not make it so.
I believe you’ve seriously misread the part of Satan. I presume you’re referring to Job here. God never asked Satan to afflict or tempt Job. Satan asked, and God allowed him to do so. To read into that a righteous mission on the part of Satan is dangerous delusion.
"Woe to those who call evil good, and good evil; Who substitute darkness for light and light for darkness; Who substitute bitter for sweet and sweet for bitter!" Isaiah 5:20
The Gospels are De Fide:
Who do you suppose tempted Christ in the wilderness? And why does Christ neglect to say “thank you” to Satan, if he was simply a righteous angel doing what God ordered? In fact, the temptation in the wilderness was powerful testimony to Christ’s divinity…so why does Jesus tell Satan to leave him alone, if Satan was only trying to help?
Matthew 4:1-11
Mark 1:12-13
Luke 4:1-13
The reason why Christ did not thank Satan for tempting Him can be found in
Mark 1:21-27. Christ rebukes the demon and orders him to keep silent, after the demon calls Him the “Holy One of God”. Why? Because demons (and Satan their leader) are evil and Jesus didn’t want or need any assistance from them. He is totally opposed to evil.
He highlights this point, and specifically names Satan as the ruler of the demons, when the Pharisees accuse Him of casting out demons using Satan’s power:
Matthew 12:22-29
And as a previous poster asked already, if your theory is that the office of “tempter” was sanctioned and approved by God, how do you explain God’s curse on the serpent, who was the first tempter? If He was doing God’s will, shouldn’t God have praised him? This idea clearly does not hold water.