Not just Shia/Sunni and almost all consider the others to be apostates and worthy of punishment leading to death.
DIVISION of ISLAM
1 Shia Islam
1.1 Twelver
1.2 Ismā'īlīsm
1.3 Zaidiyyah
2 Sufism
2.1 Bektashi
2.2 Chishti
2.3 Naqshbandi
2.4 Nimatullahi
2.5 Oveyssi (Uwaiysi)
2.6 Qadiri
2.7 Suhrawardiyya
2.8 Muridiyya
2.9 Tijaniyya
2.10 Shadiliyya
2.11 Mawlawiyya
3 Ahmadiyya
3.1 Ahmadiyya Community
3.2 Lahore Ahmadiyya Movement
4 Kharijite Islam
4.1 Ibadi
5 Other Sects
5.1 Quranism
5.2 Moorish Science
5.3 Nation of Islam
5.4 Mahdavism
5.5 Messiah Foundation International
5.6 Zikri
5.7 Five Percenter
I guess heresy and apostasy is an inherent feature of all religious groups.