Why do Muslims view Adam as sinless?
A. Islam teaches that only Allah (The One God) could forgive sins and award degrees of piety. He is the Ultimate Judge in the matter of the state of sinfulness of any member of His creation. Muslims believe that Adam was sinless because Allah declares him forgiven in the Quran. A debt that is “forgiven” remains no more. Islam teaches that Allah’s forgiveness is wider than any sin any human could commit. One passage of the Quran may be translated: “Say (O Muhammad) to My servants who have utterly transgressed against themselves (by committing sins)! Do not despair of the Mercy of Allah; verily, Allah forgives all sins. Truly, He is Oft-Forgiving, Most Merciful.” (39:53) Adam repented sincerely and Allah forgave him. It is for every sinner to mend his/her ways and benefit from Allah’s Forgiveness and Mercy.