Which is why there is an obvious orthodox, non-heretical, non-schismatic form of Islam or Christianity.
No; schism's are defined by the presence of 2 factions with strong legitimizing claims and strong political power. And usually schisms don't end with one side winning. The only demographically major schism of a major religion I can think of where one faction has well and truly died is Arian Christianity; but I'll admit I'm not extremely well versed in Hindu and Buddhist history.
From what I understand, the catholic church stomped out heresy with some efficiency.
