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.
The Creating God is Ever-Living, All-Sustainer, All-Sufficient, and Omnipotent. He does not need to die crucified, while embodied in the form of Jesus, for the sake of mankind as the Christians believe. He is the Giver and Taker of life, hence, He did not die and he was not resurrected as well. He is the One who protected His Messenger, the Jesus Christ, from being killed and crucified just as He protected His Messenger Abraham from the fire, and protected Moses from the Pharaoh and his soldiers, as He always protects and saves His righteous slaves.
Allah Almighty said:
{And for their saying, “We killed the Messiah, Jesus, son of Mary, the messenger of Allah.” But they did not kill him nor did they crucify him, but it was made to appear to them so. Even those who dispute about it are in doubt; they have no certain knowledge other than conjecture. But they certainly did not kill him. Rather, Allah raised him up to Himself, and Allah is All-Mighty, All-Wise.} [178] Surat an-Nisā’: 157-158.
A Muslim husband respects the origin of his wife's religion, be she a Christian or a Jew, her Book, and her messenger and his faith is deemed incomplete without that. He also gives her the freedom of practicing her religious rituals. The opposite; however, is not true. If a Christian or a Jew believes that there is no god but Allah and that Muhammad is the messenger of Allah, we can give him our daughters in marriage.
Islam complements and completes the creed. So, if a Muslim wanted to embrace Christianity, for instance, it would be at the expense of his belief in Muhammad and the Qur’an, and he will lose his direct relation with the Lord of the worlds by believing in Trinity and resorting to priests, saints, and others. And if he wanted to embrace Judaism, it would be at the expense of his belief in Jesus and the true Gospel, although none is allowed to embrace Judaism, in the first place, because it is a national religion, not international one, and it is the epitome of ultranationalism.