Then a deeper question is why is it omitted from the Bible that way? The Bible makes Omri sound like a major villain, not as a unifying force.
I suppose it depends on your take on Biblical inspiration. If you believe as most here do, that God guided the writer's choices in the Bible, to report what God wanted written, then the difference in Biblical vs. political interpretation is striking. Thus the omission of the Asherah prophets has a reason in God's mind. If you do not accept the prevalent view, it is just coincidence, I suppose. I once had a dream that the Asherah prophets became the Germanic subculture that stirred up the Third Reich. I could not make a historical case for it. But I still wonder where they went.
Omri followed Jeroboam's decision to split the kingdoms, and was not on God's favorite side. Yet he expanded Israelite influence and set up a worldly kingdom, though of more pagan leanings than the author of Kings would have liked. The roman Catholic church took the early church of James + Paul's outreaches, and combined it with the worldly government. Again, a growing, sucessful worldly kingdom which many feel is not what God would have wanted. The analogy works that far.
It goes a little farther: The pope can be held analgous to Ahab, incorporating pagan practices by marrying the Jezebel's of paganism. Now, who is Elijah in history? Is there one? Where is Samaria in all this - Rome? questions, no answers.