ALL sin was forgiven when Jesus shed His blood on the Cross. In Heb. it says that there is no forgiving of sin without the shedding of blood. It also says that there will be no more shedding of blood for sin. It also says that Jesus will die no more.
If that is not enough evidence that ALL the sins of the world have been forgiven, then you need to read the words of Jesus. He said that He was sent to do two things, forgive the sins of the world, and fulfill the Law and the Prophets. When He died on the Cross, He said "it is finished." So ALL the sins of the world are forgiven, Past, Present, and Future.
So, explain to me why you ask God to forgive you of your sins. Is there instructions in the Scripture where we are commanded to ask God to forgive us, or is this something that our Church forefathers started that sounded good from the pulpit? It is doctrines and traditions of man, much like a lot of other things that is taught from the pulpit. Our sins have been forgiven for a long time, and will be forgiven forever.
Are you preaching universalism here? Sure sounds like it....
And here's the scripture on repentance post resurrection, since you asked for it:
Acts 2:38
Peter replied, “
Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit.
Acts 3:19
Repent, then, and turn to God, so that your sins may be wiped out, that times of refreshing may come from the Lord,
Acts 8:22
Repent of this wickedness and pray to the Lord in the hope that he may forgive you for having such a thought in your heart.
Acts 11:18
When they heard this, they had no further objections and praised God, saying, “So then, even to Gentiles God has granted
repentance that leads to life.”
Acts 17:30
In the past God overlooked such ignorance, but now he commands all people everywhere to
repent.
Acts 20:21
I have declared to both Jews and Greeks that they must turn to God in
repentance and have faith in our Lord Jesus.
Romans 2:4
Or do you show contempt for the riches of his kindness, forbearance and patience, not realizing that God’s kindness is intended to lead you to
repentance?
2 Peter 3:9
The Lord is not slow in keeping his promise, as some understand slowness. Instead he is patient with you, not wanting anyone to perish, but everyone to come to
repentance.
Revelation 2:5
Consider how far you have fallen!
Repent and do the things you did at first. If you do not
repent, I will come to you and remove your lampstand from its place.