Are all the hadiths mentioned in the book "As-Sunnah" by Abdullah bin Ahmad bin Hanbal authentic, or are half of them weak or fabricated, as Noah Ha Mim Keller claimed on the authority of Sheikh Shu'aib Al-Arna'ut? And if that is true, then why did the son of Imam Ahmad mention the weak and fabricated hadiths, and do the aforementioned imams agree with everything attributed to Allah in this book?

The book "As-Sunnah" by Abdullah ibn Imam Ahmad addresses matters of creed by citing hadiths and narrations, including authentic (sahih), good (hasan), and weak (da'if) ones. The presence of weak hadiths does not diminish its value, as rulings are often based on authentic hadiths, and weak ones serve to strengthen a ruling, not to establish it. The authentication and weakening of hadiths are matters of ijtihad (independent reasoning), and a scholar may mention a weak hadith either because its weakness was not apparent to him, or relying on the mention of its chain of narration (isnad). Later imams, such as Ibn Taymiyyah, consider the book a source for hadiths and narrations on creed, but it is necessary to verify the authenticity of its contents before using them as evidence.