What is the stance of Islam on the original sin?

The lesson that Allah taught mankind, on accepting Adam's repentance for eating from the forbidden tree, represents the first incident of the Lord's forgiveness to mankind. The Christians' belief of inherited sin from Adam is meaningless, as no bearer of burden will bear the burden of another. In other words, everyone will be alone responsible for his own sins, and this is a manifestation of the Lord's mercy. Man is born pure and sinless and becomes responsible for his deeds since the age of puberty.

He will not be held accountable for a sin he did not commit, as he will not be granted salvation except through his faith and righteous deeds. Allah has granted man life and gave him a free will as a trial and an affliction, and he will be responsible only for his acts.

Allah Almighty said:

{...No bearer of burden can bear the burden of another. Then to your Lord is your return, and He will inform you of what you used to do. He is All-Knowing of what is in the hearts.} [176] Surat az-Zumar: 7.

Moreover, it is mentioned in the Old Testament:

"The fathers shall not be put to death for the children, neither shall the children be put to death for the fathers: every man shall be put to death for his down sin." [177] Book of Deuteronomy: 24:16.

Forgiveness does not contradict justice, as justice does not negate forgiveness and mercy.