An Ismaili is asking about the differences between us and them
Question

                The suni mulsim was RESITING QURAN we are also resiting quran they are also reasiting ead namaz we are also we are also reasiting ead namaz and etc. 
THEN WHY WE HAVE TWO RELIGIOUS SHIA & SUNI
Praise be to Allah.All of those who belong to 
          Islam and bear witness that there is no god except Allaah and that Muhammad 
          is the Messenger of Allaah recite the Qur’aan and affirm that salaah, 
          fasting, zakaah and Hajj are obligatory. But they are divided into different 
          groups, each of which has its own way as regards beliefs and acts of 
          worship. The best of these groups is Ahl al-Sunnah wa’l-Jamaa’ah, who adhere to the Qur’aan and 
          Sunnah both outwardly and inwardly, and who follow the Messenger of 
          Allaah  (peace and blessings of 
          Allaah be upon him) and the first Muslims, the Muhaajireen and Ansaar. 
          Allaah says (interpretation of the meaning): 
“Say 
          (O Muhammad to mankind): “If you (really) love Allaah, then follow me 
          (i.e. accept Islamic Monotheism, follow 
          the Qur’ششn 
          and the Sunnah), Allaah will love you” [Aal ‘Imraan 3:31] 
“And 
          the foremost to embrace Islam of the Muhaajiroon and the Ansaar and 
          also those who followed them exactly (in Faith). Allaah is well-pleased 
          with them as they are well-pleased with Him. He has prepared for them 
          Gardens under which rivers flow (Paradise), to dwell therein forever. 
          That is the supreme success” [al-Tawbah 9:100] 
 The worst of these groups are the hypocrites 
          (munaafiqeen) who make 
          an outward display of faith whilst concealing kufr 
          (disbelief). They speak words which do not reflect what is in their 
          hearts. They are the ones of whom Allaah says (interpretation of the 
          meaning): 
 “And 
          of mankind, there are some (hypocrites) who say: ‘We believe in Allaah 
          and the Last Day,’ while in fact they believe not… 
And when they meet those who believe, 
          they say: ‘We believe,’ but when they are alone with their Shayaateen 
          (devils — polytheists, hypocrites), they say: ‘Truly, we are with you; 
          verily, we were but mocking’” [al-Baqarah 2:8, 14]
 Between these two groups are others 
          which vary in their degree of closeness to good and evil. The Ismailis 
          are an extreme Raafidi group who make an outward display of loyalty 
          to Ameer al-Mu’mineen ‘Ali (may Allaah be pleased with him) whilst concealing 
          disbelief in Allaah, His angels, His Books and His Messengers. Hence 
          some of the scholars said concerning the Faatimis, who were same as 
          the Ismailis, that they make an outward display of being Raafidis, but 
          they conceal in their hearts pure kufr. They are also called Baatinis 
          because they claim that the texts and laws have hidden (baatin) 
          meanings other than those which are known to the Muslims. For example, 
          they say that the five prayers refer to the knowledge of their secrets, 
          the fast of Ramadaan is the concealment of their secrets, and Hajj is 
          travelling to meet their shaykhs. But the baatini 
          school of thought – which includes the Ismailis – is based on secrecy. 
          Their real beliefs are secrets which are known only to their leaders, 
          and these leaders are deluding the ordinary people, enslaving and exploiting 
          them, demanding from them sums of money to be paid at certain times, 
          expecting absolute obedience from them and scaring them by telling them 
          that if they go against them they will be stricken with calamities. 
          They command them to be different from the Sunnis with regard to fasting, 
          ending the fast and Hajj, although they may show some tolerance and 
          act friendly in order to deceive them. You are one of the ordinary Ismailis, 
          and you do not know the secrets that the leaders have. They do not think 
          that you are qualified to know them, because they know that if you and 
          others like you were to discover these secrets, you would be disgusted 
          and would have nothing more to do with them, and you would reject their 
          beliefs. They want you to continue being a follower, enslaved to them, 
          and they want to retain their leadership over you. Fear Allaah and free 
          yourself from this enslavement to someone other than Allaah and following 
          someone other than the Messenger of Allaah  
          (peace and blessings of Allaah be upon him), because there is no one 
          who should be followed apart from the Messenger  
          (peace and blessings of Allaah be upon him). May Allaah bless you with 
          guidance to the Sunnah and keep you away from the path of bid’ah; may 
          He open your eyes to the truth that He is Able to do all things.