Simon the magician or Simon the occult member?

Acts 8:9-12a

9 But there was a certain man, Simon by name, who beforetime in the city used sorcery, and amazed the people of Samaria, giving out that himself was some great one:

10 to whom they all gave heed, from the least to the greatest, saying, This man is that power of God which is called Great.

11 And they gave heed to him, because that of long time he had amazed them with his sorceries.

12 But when they believed Philip preaching good tidings concerning the kingdom of God and the name of Jesus Christ,