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ʾinna llāha lā yaghfiru ʾan yushraka bihī wa-yaghfiru mā dūna dhālika li-man yashāʾu wa-man yushrik bi-llāhi fa-qad ḍalla ḍalālan baʿīdan
Indeed Allah does not forgive that any partner should be ascribed to Him, but He forgives anything besides that to whomever He wishes. And whoever ascribes partners to Allah has certainly strayed into far error.
— Ali Quli Qarai
Surah An-Nisa', Verse 116
116. "Verily Allah does not forgive that (anything) be associated with Him, but He forgives less than that to whom He pleases; and whoever associates anything with Allah, has gone astray into far error."
Polytheism is an earnest deep disease. Therefore as long as it has not been rooted out in a person, morals and righteous deeds are not spiritually of avail. Repentance is the remedy of polytheism. So, a polytheist should come out of the circle of paganism in order to be involved in the forgiveness and Mercy of Allah. The ways toward the forgiveness of Allah are: repentance, pardon, good deed, and avoidance of committing great sins.