ahlus sunnah wal jamaat

Q: Is there a difference between Wahabbis and Deobandis? If yes, what is it? I know it can be a bit irrelevant but I don't go to shrines and family go. I haven't told them, I just make excuses so, I shared this with some friends and close friends said that I should write to someone but few of them said that it means that my sect is Deobandi and some said Wahabbis.

I'm sure if it's necessary to have a sect? Please tell me if I'm on the right path and if it's according to our Deen? If not then what should I do?

Q: It has been said that our Nabi sallallahu alaihi wasallam has said that Christians have 72 sects and Islam will have 73 sects and only one sect will enter paradise, can anybody say which is that right sect.