The study addresses the different theological issues among the schools of Ahl al-Sunnah wal-Jama’ah, the agreed-upon principles of creed, and aims to demonstrate that the three schools (Salafi, Ash’ari, and Maturidi) are all considered Ahl al-Sunnah wal-Jama’ah. The study emphasizes that fanaticism that may occur among the followers of these schools is condemned. The study consists of an introduction, a preliminary chapter, three main chapters, and a conclusion. The preliminary chapter defines the concept of Ahl al-Sunnah and the three schools. The first chapter discusses the different theological issues and categorizes them into four sections: theological issues related to the nature of God, prophets, scripture, and the nature of these issues themselves. The second chapter addresses the agreed-upon principles of creed. The third chapter aims to prove that the three schools are considered Ahl al-Sunnah wal-Jama’ah based on scientific evidence, theopinions of scholars, and that distinguishing between them is condemned fanaticism unsupported by the leaders of these schools. One of the notable findings of the study is that the three schools are considered Ahl al-Sunnah wal-Jama’ah, and disagreements among them are differences in branches that do not touch the fundamentals of religion.