you dont know the story behind deobandism, do you? There was only traditional Islam in Indian subcontinent untill 18th century.. There were some Ulema who were not in favor of certain Sufi ways, but they never did Takfeer on them..
Then a Mullah named Shah Ismail dehalavi visit modren day KSA and from where he brought Ibn e Abdul Wahhab's Kitab al tawheed.. he came back to India and publish that book with name of Taqwiyat ul Imaan.. from where deobandism started in India.,. Shah Ismail Dehlavi is combined founder of Deobandis and Wahhabis in South Asia..
The only difference between them and Salafis is Deobandi claim to follow Imam while Salafist dont follow anyone..
They are inspired from Wahhabism from head to toe, for example if you ask a traditional Sunni (Barelvi) about Ibn e Abdul Wahab they will curse him for all the shit happening in today's world,
but The Deobandi will never curse ibne Abdul Wahhab, they will defend his work even it cost them their lives..
similarly, deobandi like Wahhabbis are fan of Takfeer, for them Yeh bhi Kafir, woh bhi Kafir, Jo na mane wo Bhi Kafir
is equally applied towards all