Ruling on attending Qadiani conventions and maintaining relations with them:
In the light of the Quran, Hadith and the Consensus (Ijma') of the Ummah, this sect is out of the fold of Islam. In reality this sect is a conspiracy against Islam. Maintaining relations with them and attending their conventions is prohibited and forbidden for common Muslims. Attending their conventions believing them to be correct is in itself apostasy (Kufr) and defection from Islam. Allah SWT says in the Holy Quran, " And when thous seest those who meddle with Our revelations, withdraw from them until they meddle with another topic. And if the devil cause thee to forget, sit not after the remembrance, with the congregation of wrong-doers." Surah Anam Verse no.68.
Prophet Muhammad (صلی اللہ علیہ وآلہ وسلم ) has expressly prohibited Muslims from their company and also from maintaining any kind of relations with them. Accordingly there is a tradition in Sahih Muslim, " The Holy Prophet (صلی اللہ علیہ وآلہ وسلم ) says, " In the last era, dajjas, liars, deceivers (and such) false people will come. They will preach such things which neither you would have heard nor your forefathers would have heard. You maintain a distance from them and keep them at a distance from yourself lest they misguide and throw you into some trial (Fitnah)." Sahih Muslim Vol I Pg No.10 Hadith Number 70.
Also in Sunan Ibn e Majah, “And if they fall ill do not call on them, if they die do not participate in their funeral, if you meet them do not greet them with Assalamalaikum.” Sunan Ibn Majah, Muqaddimah, Bab ul Qadr.
Qadianis present themselves as Muslims, when because of their unislamic beliefs, the whole Ummah holds them as out of Islam. For this reason, Islam has such stringent rules in regard to them. Otherwise, if any nonmuslim does not embrace Islam, Islam is not thrust upon them, as there is no compulsion of any kind in Islam.
Even under an Islamic government, nonmuslims are given complete religious freedom. Keeping in mind the standards of humanity, we are instructed to treat them nicely – If they fall ill, as a human being, they should be called upon. Sahih Bukhari-Chapter of funerals
If they are poor, then they can be helped monetarily as well as the Holy Prophet (Sallallahu alaihi wa sallam) sent aid for the Meccans, when they were in the grip of a famine. (Radd ul Muhtaar Vol II Pg No.92)