Your certitude is amazing sir. I wonder from whence you get it?
Deoband was set up by Maulana Qasim Nanotvi and others (including Maulana Abdur-Rasheed Gangohi) after 1857. Said two Maulanas were initiated in Chishtia Silsila and were disciples of Haji Imdadullah Muhajir Makki. All concerned followed Hanafi Fiqh.
How can you trace Deoband to Abdul Wahab Najdi who happened to follow Hanbali Fiqh, and was inspired by Ibn-Taimiyyah???
Deobandis insist upon the importance of Tauheed more than Barelvis and that is the source of their differences. Under Saudi influence Deobandis have tilted towards Wahabist opinions, but still it would be wrong to characterize Deobandis as Wahhabis.
Deobandis have a tradition of resistance ever since 1857. Maulana Qasim, Maulana Abdur-Rasheed Gangohi, along with Haji Imdadullah Muhajir Makki fought against British forces in the area of Shamli. They lost - some fled, some were arrested, some were executed. But details of that is another story. Point is that Deobandis have a certain tradition. But that tradition has local South Asian roots, not Najdi ones.
Barelvis branded Deobandis as Wahabists, but that of course is wrong and baseless. People pick up that thread based on likes / dislikes, agendas and what-not.
So, how can you substantiate your claim that Deobandis are connected with Abdul-Wahab?