A:
They should
start with `Aqidah (creed) as our Prophet (peace be upon him) and other messengers did. This is supported by the Hadith of
Mu`adh that was mentioned earlier. However, the foregoing applies in case the people who are meant by Da`wah (calling to Islam and following the way of Allah) are Kafirs (disbelievers). Conversely, if they are Muslims, Du`ah should clarify the rulings of their Din (religion) that they are ignorant or negligent of and they should concern themselves with superior matters in succession; the one which is more important, then the one which is next to it and so on.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.