What type of religious group is an outgrowth of a sect yet remains isolated from society?

The correct answer is that a religious group that is an outgrowth of a sect yet remains isolated from society is identified as an established sect. An established sect generally maintains distinct beliefs and practices that set it apart from mainstream culture and larger religious organizations. Unlike a cult, which may often focus on a charismatic leader and could be more transient in nature, an established sect typically has more defined organizational structures and established norms.

This kind of group often originates from a schism within a larger religious tradition, diverging due to specific doctrinal differences. Its members may choose to live separately from mainstream societal norms, which contributes to its isolation. While denominations may find a balance where they maintain their beliefs but engage with wider society, established sects prioritize their distinctive religious practices and community over integration into the larger social fabric. Cults, often viewed as more fringe groups, may not necessarily be outgrowths of sects, but rather stand alone with unique belief systems and practices that may not be as structured.

Understanding these distinctions helps clarify why "established sect" is the most fitting answer in this context.