If Wahdat al-Adyaan means 'Unity of Religions' then are these interfaithers justified to use this as a 'proof' to justify their mock sense of 'interfa

Answer

Since there is simply no such concept of kufr in Islam, the deviates have no Islamic basis for their unity of religions fabricated false concoction. There is absolutely no basis for them in Islam to justify their rubbish concept of kufr and shirk.