What is the remedy for the abundance of doubts in creed and the multitude of sects, and what is the scientific methodology or the books that help in understanding these matters?

It is not appropriate for a Muslim to begin by examining doubts and the differences between sects when seeking knowledge. Rather, he should first correct his faith and learn what is necessary for his individual religious obligations, such as the rules of prayer and other matters. He must actualize the word of Tawhid by knowing its meaning, accepting it, having certainty in it, and fulfilling its conditions, in addition to the other pillars of faith. He should rely on the Qur'an and Sunnah as sources for beliefs and acts of worship, and interpret them through the books of Ahl al-Sunnah wa al-Jama'ah (the People of the Sunnah and the Community). He should also ask trustworthy scholars when there is a disagreement and avoid the books of deviant and polytheistic sects to protect his heart and creed. He should only delve into such matters if he is a specialist and intends to refute the deviants.

As for the academic methodology, he should read the Qur'an and memorize as much as he can, study books of Hadith and the biographies of the righteous predecessors, and read concise texts in creed, jurisprudence, Usul (principles of Islamic jurisprudence), and language. He should strive to obtain explanations of these texts from trustworthy scholars, such as "Al-Aqeedah Al-Wasitiyyah," "Zad Al-Mustaqni'," "Al-Mulakhkhas Al-Fiqhi," "Fiqh Al-Sunnah," "Minhaj Al-Muslim," and "Mukhtasar Al-Fiqh Al-Islami."