Wrong. Saul was an unbeliever when the Lord chose him to preach. Then, still as an unbeliever, the Lord first taught Paul personally.
Acts 9:4-6 (NKJV) Then he fell to the ground, and heard a voice saying to him, “Saul, Saul, why are you persecuting Me?” And he said, “Who are You, Lord?” Then the Lord said, “I am Jesus, whom you are persecuting. It is hard for you to kick against the goads.” So he, trembling and astonished, said, “Lord, what do You want me to do?” Then the Lord said to him, “Arise and go into the city, and you will be told what you must do.”
There is nothing in this scripture, about Jesus empowering Saul as an unbeliever, to preach the Gospel to the lost.
2
Saul was shown what to do
to be saved, first.
6 So he, trembling and astonished, said, “Lord, what do You want me to do?”
Then the Lord
said to him, “Arise and go into the city, and you will be told what you must do.”
7 And the men who journeyed with him stood speechless, hearing a voice but seeing no one. 8 Then Saul arose from the ground, and when his eyes were opened he saw no one. But they led him by the hand and brought
him into Damascus. 9 And he was three days without sight, and neither ate nor drank.
Ananias Baptizes Saul -
10 Now there was a certain disciple at Damascus named Ananias; and to him the Lord said in a vision, “Ananias.”
And he said, “Here I am, Lord.” 11 So the Lord
said to him, “Arise and go to the street called Straight, and inquire at the house of Judas for
one called Saul of Tarsus, for behold, he is praying. 12 And in a vision he has seen a man named Ananias coming in and putting
his hand on him, so that he might receive his sight.” 13 Then Ananias answered, “Lord, I have heard from many about this man, how much harm he has done to Your saints in Jerusalem. 14 And here he has authority from the chief priests to bind all who call on Your name.”
15 But the Lord said to him, “Go, for he is a chosen vessel of Mine to bear My name before Gentiles, kings, and the children of Israel. 16 For
I will show him how many things he must suffer for My name’s sake.”
17 And Ananias went his way and entered the house; and laying his hands on him he said, “Brother Saul, the Lord Jesus, who appeared to you on the road as you came,
has sent me that you may receive your sight and be filled with the Holy Spirit.” 18 Immediately there fell from his eyes
something like scales,
and he received his sight at once; and he arose and was baptized.
19 So when he had received food, he was strengthened. Then Saul spent some days with the disciples at Damascus.
20
Immediately he preached the Christ in the synagogues, that He is the Son of God.
Acts 9:6-20
Paul preached after he believed and was baptized.
JLB