Care to explain the "Whole World"? Only Shia and Sufi, Ithna Ashari, Ismaili, Barelvi oppose the teaching of him (may Allah shower his mercy upon him). He saved many from worshiping graves and stop the other innovation in Islam.
Barevli deviated from the true path, they have innovated Eid Milad-un-Nabi (Birthday), Anniversary, Barsi, Soyem, Chelum, Gyarweeh Sharif, Koonday-e-Niyaz. They are the tool of Shaitan who attack the aqeeda of Muslim. This fitna of Sufism/Barevlism also started in Bangladesh, Bangladeshi government is getting money from West to support corrupted believe of Barevlism (Bidat-e-Siyah) in Bangladesh.
These Barevis divided people, they don't want people to learn Islam and reject Barevlism. They have divided People and spread lies aganist other Muslims, especialy linking Tablighi Jamat to Wahabism.
One think I have noticed that Barelvis don't pray behind the Imam in Mecca and Medina, calling him Kafir and qustaq-e-Nabi. They also doing sajdah to roza-e-mubarak.
Barelvi total population is decreasing in Pakistan because of the effort by Dr. Israr ahmed and others who want to educated people about Islam. (Dr. Zakir Naik, even though I don't agree with him on many issues, I still think he is doing good Job educating Muslims.)
Barelvis are mainly in P unjab and very few in Sindh, NWPF and Balochistann has been saved because of the effort by Tablighi-e-Jamat. Punjabi Barelvi have taken this corrupted believe to UK and USA.