Here is an answer.
What are the fruits of salvation?
While an evidence, as James said, is not proof of salvation.
No sir, I do not see Simon Magus as being saved.
Scriptures do not support it.
In fact, the context indicates that not only Simon, but the people believed and were baptized. If Simon had not exercised saving faith, the Bible would have been clear. The context indicates that the people and Simon believed, and therefore, were saved. The problem is that he continued to have hangups, not that he wasn't saved.
Question: if he wasn't saved, why on earth would he have asked Peter this:
Acts 8:24
But Simon answered and said, “Pray to the Lord for me yourselves, so that nothing of what you have said may come upon me.”
And why on earth did Peter tell him this:
Acts 8:20
But Peter said to him, “May your silver perish with you, because you thought you could obtain the gift of God with money!
Acts 8:21
“You have no part or portion in this matter, for your heart is not right before God.
Acts 8:22
“Therefore repent of this wickedness of yours, and pray the Lord that, if possible, the intention of your heart may be forgiven you.
Acts 8:23
“For I see that you are in the gall of bitterness and in the bondage of iniquity.”
That's not what one should say to one who is not saved. No amount of "repenting of wickedness" saves anyone. They need to believe on the Lord Jesus Christ to be saved. Acts 16:31
Bottom line that is beyond dispute: The Bible SAYS that Simon himself believed, and in this context:
Acts 8:12
But when they believed Philip preaching the good news about the kingdom of God and the name of Jesus Christ, they were being baptized, men and women alike.
Acts 8:13
Even Simon himself believed; and after being baptized, he continued on with Philip, and as he observed signs and great miracles taking place, he was constantly amazed.
The obvious fact is that Simon believed what the "men and women alike" believed: the good news about the kngdom of God and the name of Jesus Christ.
That, my friend, IS saving faith.
Simon was saved, in spite of his imperfections.