In secular usage, religious education is the teaching of a particular religion (although in England the term religious instruction would refer to the teaching of a particular religion, with religious education referring to teaching about religions in general) and its varied aspects —its beliefs, doctrines, rituals, customs, rites, and personal roles. In Western and secular culture, religious education implies a type of education which largely separate from academia, and which (generally) regards religious belief as a fundamental tenet and operating modality, as well as a prerequisite condition of attendance.
The secular concept is substantially different from societies that adhere to religious law, wherein "religious education" connotes the dominant academic study, and in typically religious terms, teaches doctrines which define social customs as "laws" and the violations thereof as "crimes", or else misdemeanors requiring punitive correction.
Since people within a given country often hold varying religious and non-religious beliefs, government-sponsored religious education can be a source of conflict. Countries vary widely in whether religious education is allowed in government-run schools (often called "public schools"). Those that allow it also vary in the type of education provided.
People oppose religious education in public schools on various grounds. One is that it constitutes a state sponsorship or establishment of whatever religious beliefs are taught. Others argue that if a particular religion is taught in school, children who do not belong to that religion will either feel pressure to conform or be excluded from their peers. Proponents argue that religious beliefs have historically socialized people's behavior and morality. They feel that teaching religion in school is important to encourage children to be responsible, spiritually sound adults.
The Church Educational System of The Church of Jesus Christ of Latter-day Saints (Mormon) provides religious education in approximately 135 countries.
In traditional Muslim education, children are taught to read and sometimes speak Arabic and memorize the major suras of the Qur'an. Many countries have state-run schools this purpose (known as Madrasah Islamiyyah in Arabic; meaning "Islamic school"). Traditionally, a settlement may pay a mullah to teach children. There is a historic tradition of Sufi mullahs who wander and teach, and an ancient tradition of religious universities. However, the study of Islam does not suffice. Students must pass the state mandated curriculum to pass. Religious scholars often serve as judges, especially for criminal and family law (more rarely for commercial law). Non-Islamic religions are tolerated as personal beliefs, but not as public teaching. Most Islamic countries have laws against teaching other religions, and especially against attempts to convert Islamic believers.
In the United States, religious education is often provided through supplementary "Sunday school", "Hebrew school", catechism classes, etc. taught to children at their family's place of worship, either in conjunction with worship services or some other time during the week, after weekday school classes. Some families believe supplementary religious education is inadequate, and send their children to private religious schools, called parochial schools when they are affiliated with a specific parish or congregation. Many faiths also offer private college and graduate-level religious schools, which may be accredited as colleges. Under U.S. law, religious education is forbidden in public schools, except from a neutral, academic perspective. For a teacher or school administration to endorse one religion is considered an infringement of the "establishment clause" of the First Amendment. The boundaries of this rule are frequently tested, with court cases challenging the treatment of traditional religious holidays, displays of religious articles and documents such as the Ten Commandments, the recitation of the Pledge of Allegiance (which since 1954 has described the U.S. as "one nation under God"), and how prayer should be accommodated in the classroom.