Relevant—I’ve always said this here. If Shankaracharya is considered sectarian, then Krishna consciousness is definitely sectarian. Any religious system—whether cultural or otherwise—that promotes a specific scripture, god(s), guru, or ideology is a sect and, by definition, sectarian. Krishna is no more a universal deity than Ra, Rod, Zeus, or Jehovah.
Opinion: How Scholarship on Adi Shankarac
Forum:
"Cults," Sects, and "New Religious Movements"