The earliest Christians could make the same argument against the Apostles.
Question: Why did Christ appoint Apostles if it was not His desire to act THROUGH others who would spread the Gospel? If salvation is all about you (and you alone), then nothing from the Crucifixion onward makes any sense.
He has filled me with His Holy Spirit and guides my steps.
How do you know? Do tell.
If you don’t know what it’s like to be filled with the HS, how can I tell you? Naturally the apostles and others spread the gospel, but you don’t get saved because of them, you are saved because of HIM. If I lead someone to the Lord, and I have, I can’t take credit for it because it was God who was weaning them. I just got in on the harvest.