Peace be on you.
1- " The concept of original sin was first alluded to in the 2nd century by Irenaeus, Bishop of Lyons in his controversy with certain dualist Gnostics. Other church fathers such as Augustine also developed the doctrine,[2] seeing it as based on the New Testament teaching of Paul the Apostle (Romans 5:1221 and 1 Corinthians 15:22) and the Old Testament verse of Psalm 51:5.[4][5][6][7][8] Tertullian, Cyprian, Ambrose and Ambrosiaster considered that humanity shares in Adam's sin, transmitted by human generation. Augustine's formulation of original sin was popular among Protestant reformers, such as Martin Luther and John Calvin, who equated original sin with concupiscence, affirming that it persisted even after baptism and completely destroyed freedom.[2] Within Roman Catholicism, the Jansenist movement, which the Church then declared heretical, also maintained that original sin destroyed freedom of will.[9] On the other hand, some modern liberal Protestants deny that the doctrine has a basis in Scripture.[10].."
Source:
Original sin - Wikipedia, the free encyclopedia
2- " In the fifth century, Augustine the Bishop of Hippo, was involved in a confrontation with the Pelagian movement, concerning the controversy of the nature of the fall of Adam and Eve. He proclaimed the Pelagian movement as being heretical because it taught that Adams sin affected only himself and not the human race as a whole; that every individual is born free of sin and is capable in his own power of living a sinless life and that there had even been persons who had succeeded in doing so."
Source:
https://www.alislam.org/library/books/christianity_facts_to_fiction/chapter_2.html
3-
a-Deuteronomy 24:16 New International Version (NIV)
16 Parents are not to be put to death for their children, nor children put to death for their parents; each will die for their own sin.
b-Galatians 6:4 and 5 New International Version (NIV)
4 Each one should test their own actions. Then they can take pride in themselves alone, without comparing themselves to someone else,
5 for each one should carry their own load.
c- James 2:14New International Version (NIV)
Faith and Deeds
14 What good is it, my brothers and sisters, if someone claims to have faith but has no deeds? Can such faith save them?
26 As the body without the spirit is dead, so faith without deeds is dead.
4-Anti Christ thing is related to latter days but mistake of invention of original sin theory had started much earlier!
5-Anti christ is using this theory for its agenda of Godlessness, moral-lessness and spirtuality-lessness.....Anti Christ will melt with the prayer and spiritual attention of Promised Messiah the Mahdi - the ardent devotee of Holy Prophet (s.a.w.) [Ahmadiyya Muslims believe, he has come in 1889 now his fifth Khilafat is serving --- the peaceful service to restore faith alislam.org ]