After discussing the question put to the Islamic Fiqh Council in Capetown, South Africa, concerning the ruling on the Qadianis and their off-shoot which is known as Lahoriyyah, and whether they should be counted as Muslims or not, and whether a non-Muslim is qualified to examine an issue of this nature:
In the light of research and documents presented to the members of the council concerning Mirza Ghulam Ahmad al-Qadiani, who emerged in India in the last century and to whom is attributed the Qadiani and Lahori movements, and after pondering the information presented on these two groups, and after confirming that Mirza Ghulam Ahmad claimed to be a prophet who received revelation, a claim which is documented in his own writings and speeches, some of which he claimed to have received as revelation, a claim which he propagated all his life and asked people to believe in, just as it is also well-known that he denied many other things which are proven to be essential elements of the religion of Islam
In the light of the above, the Council issued the following statement:
Firstly: the claims of Mirza Ghulam Ahmad to be a prophet or a messenger and to receive revelation are clearly a rejection of proven and essential elements of Islam, which unequivocally states that Prophethood ended with Muhammad (peace and blessings of Allaah be upon him) and that no revelation will come to anyone after him. This claim made by Mirza Ghulam Ahmad makes him and anyone who agrees with him an apostate who is beyond the pale of Islam. As for the Lahoriyyah, they are like the Qadianiyyah: the same ruling of apostasy applies to them despite the fact that they described Mirza Ghulam Ahmad as a shadow and manifestation of our Prophet Muhammad (peace and blessings of Allaah be upon him).
Secondly: it is not appropriate for a non-Muslim court or judge to give a ruling on who is a Muslim and who is an apostate, especially when this goes against the consensus of the scholars and organizations of the Muslim Ummah. Rulings of this nature are not acceptable unless they are issued by a Muslim scholar who knows all the requirements for being considered a Muslim, who knows when a person may be deemed to have overstepped the mark and become an apostate, who understands the realities of Islam and kufr, and who has comprehensive knowledge of what is stated in the Qur�aan, Sunnah and scholarly consensus. The ruling of a court of that nature is invalid. And Allaah knows best.
Majma� al-Fiqh al-Islami, p. 13