Is this an authentic Hadith from the Prophet (pbuh) that says that the Ummah will be divided into 73 groups and only one group will enter paradise, those who follow the Jama'ah of the Muslims?
The Hadeeth which is narrated in Shia and Sunni books is (My Ummah will be divided in to seventy three sects). The additional words which you quoted are not authentic. Obviously, the followers of the Quran and the Progeny of the Prophet (SAWA) will be saved because they are the real followers of the Prophet (SAWA).
Wassalam.