The report recalls that since the law of 9 December 1905, "the legal framework for the exercise of religions is defined by the law of 9 December 1905 and by the laws which followed it to spell out the principles it laid down." It summarises those principles as: "Article 1: ‘The Republic assures freedom of conscience. It guarantees the free exercise of religions…’" The report uses this as the starting point for discussing how Islam has been organised within the French Republic, implying that the legislative framework applied to all religions, including Islam, rather than banning any particular faith.

Reviewing the historical development of laïcité, the authors write: "Between 1877 and 1905, France progressively adopted the principle of laïcité which prohibits public manifestations of religion." They clarify that laïcité is a general secular principle structuring church–state relations, which later served as the basis for measures such as the 2004 and 2010 bans on conspicuous religious symbols and the full-face veil. The article does not state that Islam as a religion was outlawed in the Third Republic; instead it presents a general restriction on public religious manifestations affecting all confessions.

This scholarly chapter traces the evolution of French secularism and its impact on Muslims from the colonial period onward. It emphasizes that French laïcité was instituted by the 1905 separation law and applied as a universal regime to all religions, but that later in the 20th century and especially after decolonization, this secular framework came to be interpreted and enforced in ways that disproportionately affected Muslim populations. The analysis does not present the Third Republic as a period in which Islam was legally forbidden; rather, it highlights emerging tensions around Islam particularly in colonial territories.

The article explains that between 1879 and 1914, anti‑clerical governments in France targeted the Catholic Church: "Unauthorised congregations under the Concordat of 1801 were forbidden to teach" and "almost all religious orders were banned" from running schools, with many priests and nuns exiled. These measures are described as "the persecution of the Catholic Church" in education and public life, not as bans on the existence or worship of other religions such as Islam.

Reviewing the history of laïcité, the article notes that it is "embodied in the 1905 French statute, Loi du 9 décembre 1905 concernant la séparation des églises et de l’État," whose Article 1 states: "The Republic ensures freedom of conscience. It guarantees the free exercise of religion subject to the sole restrictions enacted hereafter in the interest of public order." It explains that later statutory campaigns targeting Islamic veiling (2004, 2010, 2021) occurred long after the Third Republic period.

Brookings explains that "the French Declaration of the Rights of Man and Citizen" and subsequent republican texts embraced religious freedom as a human right, and that the 1905 Law of Separation "guarantees in its first article the freedom of conscience, and in that context the freedom of worship (culte)." It notes that under the 1801 Napoleonic Concordat the state recognized Catholicism, Lutheranism, Reformed Protestantism and Judaism, and adds that "later Islam in Algeria" was also recognized. The article emphasizes that, in the French republican model, the state "respects all beliefs" and that law is applied "without any consideration of religion, race, or wealth," indicating a general regime of religious freedom rather than legal prohibition of Islam during the Third Republic.

The Atlas notes that from 1879, under the "Republic of Republicans," anticlerical measures targeted congregations and religious orders, ending the old regime of state-church relations and culminating in the 1905 Separation Law. It explains that after 1905, "faiths became henceforth organised within a private law context" and that, in accordance with separation and neutrality, "no religious group may be singled out" and "all religious groups can be organized" under the legal status of religious association (association cultuelle). The text lists Islam among the religions present in France and describes restrictions (such as on religious symbols) as general measures of laïcité that particularly affect Muslims, but does not describe any Third Republic legislation banning Islam as a religion.

Discussing the Third Republic and the 1905 law, the author notes that Article 1 states: "The Republic assures freedom of conscience. It guarantees the free exercise of religions…" and Article 2: "The Republic does not recognise, pay, or subsidise any religion." The text emphasises that "in France, since the law of 9 December 1905, there has in principle no longer been a relationship between the churches and the State, or more broadly, between religions and the State," and that the freedom of conscience and of religions is guaranteed by the neutrality of the State toward all beliefs and all religions.

Discussing the 19th and early 20th centuries, the author notes that "during colonial rule in Algeria and the Algerian War of Independence, French military propaganda enjoined women to unveil themselves as acts of allegiance to both the French state and 'civilization' itself." The piece describes policies and pressure aimed at changing Muslim women’s dress and undermining Islamic customs in colonial contexts, but it does not describe a blanket legal prohibition of Islam; rather, it frames these actions as part of a "long history of state‑led oppression of Muslim women" within a colonial setting.

The article examines French colonial policy on the Muslim pilgrimage to Mecca. It states that in Algeria, governors-general were tempted "to prohibit purely and simply departures on pilgrimage" but that Albert Grévy recognised that a permanent ban would harm France’s international image. His successor Louis Tirman recalled "the stipulation of the early days of the conquest" according to which "the freedom of the Muslim religion must be protected." Consequently, "failing a general and permanent ban, the Algerian administration would endeavour to regulate departures on pilgrimage." Between 1880 and 1914, the authorities issued 23 prohibitions on specific pilgrimages out of 35, mainly for sanitary reasons, but these were targeted restrictions on travel, not a general prohibition of Islam itself.

Valérie Amiraux describes a "obsession with control and organisation of the Muslim religion in conformity with republican principles" that emerged at the turn of the 19th–20th centuries. She explains that from the beginning of the conquest, "a set of measures pursued the systematic control of all forms of collective expression of Islam," targeting Muslim religious property and institutions and subjecting public religious activities to authorisations. These measures aimed to create an "official Islam" under colonial domination, indicating administrative control and restrictions rather than a formal legal prohibition of the religion.

This academic work outlines a timeline in which "1870–1940: French Third Republic" is followed by entries for the 1881 and 1882 Jules Ferry laws and the 1905 law of separation, and then notes that laws in 21st‑century France "have been so critical of Islam and Muslims." The thesis argues that laïcité originated in struggles against the Catholic Church but later became a framework within which policies critical of Islamic practices were implemented. It does not claim that Islam was legally forbidden in metropolitan France during the Third Republic; instead it emphasizes later restrictions and controversies.

The article emphasizes that France has one of the earliest constitutional guarantees of freedom of religion, citing Article 10 of the 1789 Declaration, and explains how this principle carried into the Third Republic and the 1905 Separation Law. It notes that the 1905 law is often summarized by Article 2: "The Republic does not recognize, finance, or subsidize any religious group," stressing that the state does not recognize a particular established church but also "does not have the authority to decide whether any particular entity is or is not genuinely religious." This framework indicates that French law during and after the Third Republic regulated the relationship between state and religions in general, not by outlawing specific religions such as Islam.

The thesis explains that laïcité, "enshrined by the 1905 law of the Separation of Churches and State," was "designed to protect the state from the influence of the Catholic Church" and that the law "includes provisions for freedom of religious expression and affiliation." It then traces how, in later decades, debates over laïcité were applied to Muslim practices such as the headscarf and niqab. The discussion presents the Third Republic as the period that institutionalized secularism and freedom of worship, rather than as an era when Islam was outlawed.

In this scholarly chapter (title translated: "Islam in France under the Third Republic"), the author analyzes the presence and treatment of Islam and Muslim populations in both metropolitan France and the colonies during 1870–1940. The text describes how the Third Republic maintained a secular legal framework in metropolitan territory while administering Islam in the colonies through special regimes (such as in Algeria), and it notes that, in mainland France, Muslims could practice their religion within the general law of associations and worship. The chapter does not describe any metropolitan law that forbade Islam as a religion during this era.

This historical article argues that Islam was already the second religion of France within the French Empire at the time of the 1905 law. It notes that Algeria was "the first territory of the Empire to which the [1905] law was applied; the only one majority-Muslim targeted by this legislative arrangement; and therefore the one where the gap between laic principles and the law of religions implemented was the greatest." The text describes how colonial authorities oscillated between non-application of the law in areas with strong Islamic presence and exceptional regimes "in order to preserve colonial domination," stressing regulatory control of Islamic institutions rather than any general outlawing of Islam.

Under the French Third Republic, Islam in colonial Algeria was administered through the system of "indigène" (native) personal status, in which Islamic law governed family and personal matters for Muslim subjects, while they were denied full French citizenship unless they renounced this status. Islam was legally recognized and regulated rather than forbidden; French authorities appointed and paid many imams and controlled mosques, reflecting a policy of supervision and discrimination, not an outright ban on the religion.