Salvation is the most personal act between a person and God. It is entered into in the quiet of one’s soul. No one can lead another to salvation. One can only be saved by being found by God in the most desperate need of His grace.
By this I take it you've never shared the Gospel with someone.
Paul lead many to salvation.
"For I speak to you Gentiles, inasmuch as I am the apostle of the Gentiles, I magnify mine office: if by any means i may provoke to emulation them which are my flesh and might SAVE some of them." (Romans 11:13,14)
"How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? And how shall they hear without a preacher?...Faith comes by hearing, and hearing the word of God.' (Romans10:14-17)
Jesus said, "Lift up your eyes, and look on the fields; they are white already to harvest" (John 4:13)
People are perishing because Christians do not share the Gospel, but instead say what you say, what I used to say, which is "no one can save anybody." This stands refuted on its face by the Bible, by Paul, by Jesus himself. One sows, another reaps. But someone has to sow the word by sharing the Gospel, for it is the Gospel which saves (1 Corinthians 15:1,2)
Yes and no.
The Great Commission commands every believer to communicate the Gospel to unbelievers, or in effect lead them to salvation.
All three persons of the Trinity are involved in salvation, but only God the Father can convert the unbeliever to faith in Christ. It is His work in us. No human being is able to convert another human to Christianity. The conversion, though, requires knowledge of God and faith in what was provided at the Cross.
Communicating the Gospel is a very efficient method of the unbeliever becoming aware of salvation.