Is it sufficient for a Muslim's upbringing in a Muslim society and their receiving Islamic education in schools to learn what needs to be known about the religion? And what are the duties that a Muslim must learn concerning creed and other aspects, in addition to what rectifies their acts of worship?

Sacred knowledge is divided into fard al-ayn (an individual obligation, incumbent upon every Muslim) and fard al-kifayah (a collective obligation, where the duty is lifted if a sufficient number of people perform it). The knowledge that is fard al-ayn for every Muslim includes knowledge of the Oneness of Allah and the pillars of faith, as well as the apparent rulings for obligatory duties such as prayer and zakat for those who possess wealth. It also includes the rulings of buying and selling for those engaged in trade, and general knowledge of prohibited acts. Merely growing up in a Muslim society or studying in its schools does not guarantee the acquisition of this fard al-ayn knowledge, nor does it excuse one for negligence in learning it.