Aḥmad Riḍā Khān states:
The worst of the murtaddīn is the murtadd munāfiq –whose company is more harmful than the company of a thousand Kāfirs, since they teach Kufr while behaving as Muslims. Especially the Deobandī Wahhābīs, because they call themselves specifically Ahl al-Sunnah wa l Jamā‘ah, and behave as Ḥanafīs, behave as Chishtī Naqshbandīs. They pray and fast like we do; they read and teach our books; and they swear at Allāh and His Messenger.* They are the deadliest poison. (Aḥkām e Sharī‘at, p. 130)
* When quoting this passage, Mawlānā Sarfrāz Khān Ṣafdar comments on these words: “Allāh’s curse be on the liars.” (Rāh e Sunnat, p. 7)
Aḥmad Riḍā Khān also says:
The Tabarrā’ī Rāfiḍī, Deobandī Wahhābī, Ghayr Muqallid Wahhābī, Qādiyānī, Chakrālwī (“Ahl al-Qur’ān”), naturists (Sayyid Aḥmad Khān etc.) – the slaughtered meat of all of these is pure filth and carrion, and categorically ḥarām, no matter if they take the divine name a thousand times, and however pious and scrupulous their behaviour, because these are all Murtaddīn; and there is no slaughter for a Murtadd. (Aḥkām e Sharī‘at, p. 140)
Notice, he makes a blanket rule for all “Deobandīs”, grouping them with Qādiyānīs, Rāfiḍīs and Chakrālwīs, and makes no exception whatsoever.
Aḥmad Riḍā Khān further states:
Nadhīr Ḥusayn Dihlawī, Amīr Aḥmad Sahsawānī, Amīr Ḥasan Sahsawānī, Qāsim Nānotwī, Mirzā Ghulām Aḥmad Qādiyānī, Rashīd Aḥmad Gangohī, Ashraf Alī Thānawī, and all their adherents, followers and devotees and those who praise them are by agreement of the notable scholars Kāfirs; and those who do not recognise them to be Kāfirs, and doubt their Kufr, are also without doubt Kāfirs, let alone regarding them to be leaders and masters! (‘Irfān e Sharī‘ah, p. 54)
In other words, even those who praise the elders of Deoband or regard them to be their teachers and leaders are also Kāfirs according to Aḥmad Riḍā Khān Barelwī!
He also states:
My approach is that [Shāh Ismā‘īl] is like Yazīd: if someone calls him Kāfir I wouldn’t stop him and I wouldn’t call him [this] myself. However, anyone who doubts the disbelief of Ghulām Aḥmad [Qādiyānī], Sayyid Aḥmad [Khān], Khalīl Aḥmad [Sahāranpūrī], Rashīd Aḥmad [Gangohī] and Ashraf ‘Alī [Thānawī] is himself a Kāfir. (Malfūẓāt A‘lā Ḥāḍrat, Da‘wat e Islāmī, p. 172)
Note, how he treats these senior Sunnī Ḥanafī imāms of the Deobandī tradition as being equal to the false prophet Ghulām Aḥmad Qādiyānī and the extreme modernist Sayyid Aḥmad Khān. And on what basis? For Mawlānā Rashīd Aḥmad Gangohī, based on a fatwā misattributed to him which he himself denied! For Mawlānā Qāsim Nānotwī, based on an assumption that his explanation of the title Khātam al-Nabiyyīn in Taḥdhīr al-Nās allows for new prophets to come, despite the fact that Mawlānā Qāsim Nānotwī explicitly states in Taḥdhīr al-Nās itself that this is not possible and if anyone claims that it is he is a Kāfir! For Mawlānā Khalīl Aḥmad Sahāranpūrī and Mawlānā Ashraf ‘Alī Thānawī, based on a clear misreading of their passages from Barāhīn e Qāṭiah and Ḥifẓ al-Imān respectively.
Mawlānā Khalīl Aḥmad Sahāranpūrī refutes a false analogy which affirms greater knowledge for the Prophet (ṣallallāhu ‘alayhi wasallam) in certain (unbeneficial) worldly matters to that of Satan and the Angel of Death. Aḥmad Riḍā Khān interpreted this as Mawlānā Khalīl Aḥmad Sahāranpūrī declaring Satan as being more knowledgeable than the Prophet! Mawlānā Ashraf ‘Alī Thānawī argued that if a person calls the Prophet (ṣallallāhu ‘alayhi wasallam) ‘Alim al-Ghayb on account of partial knowledge of the unseen, then this is not a quality unique to the Prophet (ṣallallāhu ‘alayhi wasallam) since partial knowledge of the unseen is also found in laymen, children, madmen and animals. Aḥmad Riḍā Khān interpreted this as Mawlānā Ashraf ‘Alī Thānawī having equated prophetic knowledge to that of animals and madmen!
Based on these (deliberate) misreadings, he engaged in a campaign of mass/chain-takfīr, which makes Kāfirs of a significant population of the Muslims of India and beyond, numbering in the tens of millions if not in the hundreds of millions of Muslims. Many Barelwīs who would have at least momentarily experienced or even expressed doubts over Aḥmad Riḍā Khān’s fatwās of Kufr on the elders of Deoband will according to his fatwā automatically become Kāfir and have to renew their īmān!
What can this mad takfīrism of Aḥmad Riḍā Khān be called? Insanity? Madness? Dajl? Shayṭāniyyah? Whatever it is, a mad takfīrī like Aḥmad Riḍā Khān Barelwī cannot be a pious Muslim authority, let alone a Mujaddid! He must either be an insane, raving lunatic, or a wicked shayṭānic dajjāl.