Did Ibn Hazm Oppose Ahl al-Sunnah?
Regarding what is attributed to Ibn Hazm — that he, in certain chapters, contradicts Ahl al-Sunnah: what the scholars have noted is that he is not entirely contrary to Ahl al-Sunnah, though he does deviate in certain things. For example, what he mentioned in the introduction to Al-Muhalla — that one who abandons good deeds entirely (tarik jins al-'amal) does not become a disbeliever. This contradicts the position of Ahl al-Sunnah. But Ibn Hazm, in his overall treatment of matters of faith (iman), follows the approach of Ahl al-Sunnah wal-Jama'ah, though there are things he opposes them in — such as that mentioned in the introduction to Al-Muhalla — that one who abandons good deeds entirely (tarik jins al-'amal).
Questioner: In the chapter of aqeedah, does he have other mistakes other than his mistakes in al-asma' wal-sifat?
There are things, yes, but in al-asma' wal-sifat it is most prominent — in the chapters on the Names and Attributes of Allah (al-asma' wal-sifat), he contradicts Ahl al-Sunnah wal-Jama'ah.