@psyah Salaam
Brother … when you talk about Ashari, Maturidi, Athari, or various theological school of thought … I think you are just trying to confuse people. 
These belief systems (or theological school of thoughts) are way of looking at things, but it does not determine beliefs, nor make beliefs differences same, neither give answer to major belief differences between sects. Actually, all these theological schools were non-existent at the time of Prophet (SAW) or Sahabas, when beliefs were already developed and were there for all to follow.
Let me give you some (from many) differences between beliefs/aqeedahs of Sunnis, Deobandis and Wahabis from what I understand, as concisely as possible, without justifying or refuting any beliefs or sects. You can see how different they are from each other.
[TABLE]
Without defending or refuting any beliefs … I am putting down some (from many) differences between beliefs (or Aqeedah) of Sunni, Deobandi and Wahabi.
Sunni
(Suffi or Barelvi)
Deobandi
Wahabi
(Salafi, Ahle-hadith)
Death means cover-up. Once a person dies, distance becomes meaningless, so soul can be present at any place soul desires. Soul senses what is happening in this world. Can hear and see us and can act accordingly. Could pray for us. Soul has connection with this world and his grave.
Person once dead, soul is send to a place where it gets isolated. Soul has little link to this world. Has little connection with his grave. Cannot do anything for people alive.
After death, soul has no link with this world, rather is as good as dead. Soul cannot hear or see people alive. Has no connection with own grave nor can do anything for people who are alive.
Sunnis beleive that dead can hear calls, especially Prophet (SAW) and Saints cannot only hear, but give response too that we cannot hear or feel. Thus, they give calls like Ya Rasul-Allah …Ya-Ali, Ya-Ghaus-e-Pak … and these are common calls Sunni regularly make, especially at times of need or rememberance.
Deobandis do not believe on this, and think that such calls are shirk.
Wahabis have similar beliefs in this respect than Deobandis.
Sunni believe that Prophet (SAW) is alive, present at whatever place he is remembered, hears us, and can pray for us. Prophet (SAW) can become waseela at anytime for anything, and can help us in many ways.
Visiting grave of Prophet (SAW) gives us plenty of reward and it is as if one is visitng him while he was alive.
Deobandis believe that Prophet (SAW) was as human as any person, except that Allah chose him to be prophet.
Some deobandi may visit grave of prophet (SAW), but in general, they have no regards in this matter. Most coniser that praying at grave of Prophet (SAW) or any person is not allowed (in their belief system)
Wahabis think Prophet (SAW) was a human just like any person. Consider visting grave of Prophet (SAW) or any person as shirk, especially praying there.
Many Wahabi thinks that grave or Prophet (SAW) should be demolished, as people (Sunni and Shia) visit and do dua at the graves of prophet (SAW), thus it is cause of shirk.
Sunnis believe that birthday of Prophet (SAW) is auspious day, that Muslims should celebrate … and they do celebrate as Eid-Milad-ul-Nabi with much more happiness than any other day.
Deobandi do not believe that Prophet (SAW) birthday should be celebrated, considering it as innovation in Islam, and sin.
Wahabi have similar belief like Deobandis
Sunnis think that on judgment day, no person would be safe from hell fire just because of deeds, but Waseela if found, would be most important in saving a person from hell fire. Consider that the waseela could come from Prophet (SAW) and/or people who are close to Allah (Saints)
Thus, Sunnis try to develop spiritual relationship with people close to Allah, by creating love in them for Prophet (SAW) and people close to Allah.
Deobandi believe that it is only deed that can save a person from hell fire.
Wahabis have similar belief like Deobandi.
Sunni believe that progeny of Prophet (SAW) has special status and we should revere them, as revering them is revering Prophet (SAW) and through them one can find waseela of Prophet (SAW).
For deobandi, some do revere them, but think that there is no benefit but it is personal matter, and all human being are same.
Wahabi damn care, rather show hate towards people who may show love and respect towards progeny of Prophet (SAW).
Actually, there are many differnces in belief/aqeedah of Sunnis, Deobandis and Wahabis, I have put down few.