Religious law refers to the concept of a religious system or document being used as a legal resource, refers to the concept that the word of God is law. The use of religion for public law has a static and permanent quality, preventing improvement during legislative acts of government or development during judicial antecedent.
The most important kinds of religious law are Halakha in Judaism, Sharia in Islam, both of which denote the "path to follow", and Canon law in some Christian groups. In some cases these are proposed simply as individual moral guidance, whereas in other cases they are proposed and may be used as the source for a country's legal system.
The Halakha is followed by traditional and conservative Jews in both ecclesiastical and civil relations. No country is completely governed by Halakha, but two Jewish people may decide, because of personal belief, to have an argument heard by a Jewish court, and be limit by its rulings. Sharia Law governs some number of Islamic countries, counting Saudi Arabia and Iran, although most countries use Sharia Law only as a complement to national law. It can refer to all characteristics of civil law, including property rights, contracts or public law.
Canon law is not religious law, appropriately speaking, because it is not found in revelation. Instead, it is seen as human law motivated by the word of God and applying the petitions of that revelation to the actual condition of the church. Canon law normalizes the internal ordering of the Roman Catholic Church, the Eastern Orthodox Church and the Anglican Communion. Canon law is rectified and modified by the legislative authority of the church, such as councils of bishops, single bishops for their respective sees, the Pope for the entire Catholic Church, and the British Parliament for the Church of England.
The implication of religion for law is inalterability, because the word of God cannot be rectified or legislated against by judges or governments. However religion never proportions a complete and detailed legal system. For instance, the Quran has some law, and it acts only as a resource of further law during interpretation. Other example is the Torah or Old Testament, in the Pentateuch or Five Books of Moses. This involves the fundamental code of Jewish law, which some Israeli communities decide to use.