There is a hadith that talks about Jews becoming 71 sects, 1 enters paradise and 70 will enter hell fire. The Christians will become 72 sects, 1 will enter paradise and 71 will enter hell fire. The Muslims will become 73 sects, 1 will enter paradise and 72 will enter hell fire.
It was i believe asked which group of the Muslims will enter paradise and the group being the main body.
Logically one could indeed confirm it being this one. How? This day and age, the "sunni is the mainstream". However just because the sunni-group being the mainstream one, one could say this doesn't mean it is the right one. However even this question can be asked based on logic, rationality and reason that it is the right one.
The sunni is a group that is it's teaching are based on the Qur'an and (strong)-hadith. In other words we do things (pray, wudu, ghusl, eat with right hand, be good to our parents, siblings, neighbors, people, do not eat pork, drink wine, have zina, not because we "feel" like it etc. etc. , but we base in on certain proof. So on the Day of Judgement if it is asked of us every individual among us, how come you did not eat pork for example, we say based on this and that proof it was made clear for us that it is PROHIBITED to eat it. Every aspect of our lives is already made clear how to do it and what is not clear, there are methods that can be used to clarify it.
For example, when there is something that was unknown in the past, but we have to deal it in the present time. You look at it. If one MUST choose between 2 evils, Islam says choose the lesser evil. For example, a couple of weeks ago a family member was talking to me and said he was planning to go buy a house with his wife. I said according to Islam it is prohibited as it included usury(riba) and such. I said living in a rented house that also includes riba, compared to buying a house that includes riba is having a rented house better. As it is a lesser evil. He however tried to defend it. How do i know he KNEW also it was wrong? When i know something, i say it and i stop talking about. However he kept talking and talking and talking to defend it..which from psychological perspective is a sign somebody indeed also knows it and tries to justify their decision, while it is clear as sky is clear from earth why it is a wrong decision. I left him as he is as he himself knows and i did not want to go in argument. However also on the Day of Judgement i may be testifying against him if he indeed still have followed such path.
About Mahdi, i will refrain from saying anything.
So the question is, is somebody who belongs to one of those groups have a "better" mentality than me who just follows Qur'an and Sunnah and says he is a Muslim? Off course not, because Qur'an and Sunnah makes it obligatory for me to be good to others, to search for knowledge, to give prayer it rights (doing it slowly and with concentration), to do dhikr(remembrance of Allah) with concentration, to be good to my wife and give a good upbringing to my children etc. etc. Islam sub'han'Allah is as complete as it can get. No addition needed that for example we see people trying to added. As just recently some Turkish woman opened a mosque in Germany so all kind of groups can including men and women can pray next to one another (equality =_=!). I'm sorry but if i pray behind a woman and i see her behind will sorry but i have not prayed AT ALL. As all went through my head is everything except concentration of the prayer. This every person who has just a BIT of logic can have this conclusion, but these people who come up with such things are not really trying to please Allah, rather trying to please people. Just look at western media, they went with their camera's to the opening like packs of wolves. Because they liked that idea, while what i want or want you we do not go by. We go by what Allah wants.
Anyhow bro, think about it. Feeling a Muslim, not Sunni, or any group with a feeling of having a balanced approach will only satisfy you. Nothing else. On the Day of Judgement also you will be able to answer for every action you have done because you have done it according to Qur'an and (strong) hadith. If one even would have had a talk with Said Nursi, he would have told you that he has NOT introduced anything new. Rather a refreshment of Islam and what it stands for (pursuing scientific knowledge). However people like Gulen and Erdogan they twist things because they themselves do not understand of it or have some hidden agenda. Which you see clearly with both of the groups (nationalism). If you read the story of Said Nursi you will see he stood up AGAINST Mustafa Kemal and his ideology (nationalism). While right now Gulen and Erdogan raise nationalism up high.