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.
Christianity has had a schism and it quite clearly involved both sides considering the other heretics in their beliefs.Alternatively, the presence now of sects in Christianity at least still consists of the various sects vehemently disagreeing with the others. Just because war isn't apparent between them recently due to modern times doesn't mean that its wasn't very divisive.
At any rate, this is somewhat off topic.
