The preaching of the cross is preaching Jesus died for our sins. You preach we don't even have to know what are sins are.
The truth is you admitted that there were other sins you needed to repent of later on that you did not know about and that is why discipleship is separate from salvation because we need to be saved by Jesus Christ to have Jesus Christ in us by believing in Him so we can be in that race and be able to run it, looking to the author & finisher of our faith to help us lay aside every weight & sin daily.
When Paul used to be known as Saul, the persecutors of Christians, and he was on his way on the road to Damascus to arrest more Christians, what had happened while on that road still being an evil ungodly murderer?
1 Timothy 1:14 And the grace of our Lord was exceeding abundant with faith and love which is in Christ Jesus. 15 This is a faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief. 16 Howbeit for this cause I obtained mercy, that in me first Jesus Christ might shew forth all longsuffering, for a pattern to them which should hereafter believe on him to life everlasting.
Do read the very account in Acts and point out where Ananias was to call Saul to repent from all sins before he could come to & believe in Jesus Christ. Ananias never challenged Saul to prove he had repented from killing Christians.
Acts 9:1And Saul, yet breathing out threatenings and slaughter against the disciples of the Lord, went unto the high priest, 2 And desired of him letters to Damascus to the synagogues, that if he found any of this way, whether they were men or women, he might bring them bound unto Jerusalem.
3 And as he journeyed, he came near Damascus: and suddenly there shined round about him a light from heaven: 4 And he fell to the earth, and heard a voice saying unto him, Saul, Saul, why persecutest thou me? 5 And he said, Who art thou, Lord? And the Lord said, I am Jesus whom thou persecutest: it is hard for thee to kick against the pricks.
6 And he trembling and astonished said, Lord, what wilt thou have me to do? And the Lord said unto him, Arise, and go into the city, and it shall be told thee what thou must do.
7 And the men which journeyed with him stood speechless, hearing a voice, but seeing no man. 8 And Saul arose from the earth; and when his eyes were opened, he saw no man: but they led him by the hand, and brought him into Damascus. 9 And he was three days without sight, and neither did eat nor drink.
10 And there was a certain disciple at Damascus, named Ananias; and to him said the Lord in a vision
, Ananias. And he said, Behold, I am here, Lord. 11 And the Lord said unto him, Arise, and go into the street which is called Straight, and enquire in the house of Judas for one called Saul, of Tarsus: for, behold, he prayeth, 12 And hath seen in a vision a man named Ananias coming in, and putting his hand on him, that he might receive his sight.
13 Then Ananias answered, Lord, I have heard by many of this man, how much evil he hath done to thy saints at Jerusalem: 14 And here he hath authority from the chief priests to bind all that call on thy name. 15 But the Lord said unto him, Go thy way: for he is a chosen vessel unto me, to bear my name before the Gentiles, and kings, and the children of Israel: 16 For I will shew him how great things he must suffer for my name's sake.
17 And Ananias went his way, and entered into the house; and putting his hands on him said,
Brother Saul, the Lord, even Jesus, that appeared unto thee in the way as thou camest, hath sent me, that thou mightest receive thy sight, and be filled with the Holy Ghost. 18 And immediately there fell from his eyes as it had been scales: and he received sight forthwith, and arose, and was baptized. 19 And when he had received meat, he was strengthened. Then was Saul certain days with the disciples which were at Damascus. 20 And straightway he preached Christ in the synagogues, that he is the Son of God.
Can you see the call to repent from all sins here?
Can you see the call to repent from any sins here? All I see is a hearty rebuke from the Lord Jesus Christ for not believing in Him and it is by the grace of God that Saul was led to believe in Him to be saved.