Ok, I am going to agree with you here. Clearly, that sorcerer was not a believer because he thought he could purchase gifts of the Holy Spirit like you would a pack of bubble gum. I think
John 10 supports the idea that no one who belongs to Christ can lose his salvation.
John 10:
Jesus at the Feast of Dedication
22At that time the Feast of Dedication took place in Jerusalem. It was winter,
23and Jesus was walking in the temple courts in Solomon’s Colonnade.
24So the Jews gathered around Him and demanded, “How long will You keep us in suspense? If You are the Christ, tell us plainly.”
25“I already told you,” Jesus replied, “but you did not believe. The works I do in My Father’s name testify on My behalf.
26But because you are not My sheep, you refuse to believe.
27My sheep listen to My voice; I know them, and they follow Me.
28I give them eternal life, and they will never perish. No one can snatch them out of My hand.
29My Father who has given them to Me is greater than all. No one can snatch them out of My Father’s hand.
30I and the Father are one.”
After prayerfully considering your claim, I think the real issue is, there are many who think they are Christ's but are found to not be. Even Judas thought He was Christ's but turns out he wasn't. Point is I guess even wannabe's can come, but once they find out what it entails serving Christ, we all find out they are knock-off's- don't possess the real seal of approval. Someone else's hand is really involved with their making.
So, my verdict- No child of God can lose his salvation but not all who claim to be children of God are.