Which term describes a group that tends to hold unconventional beliefs or practices?

The term "sect" refers specifically to a subgroup within a larger religious or philosophical system that often holds beliefs or practices that deviate from the mainstream orthodoxy. Sects are typically characterized by their unconventional stances and distinct ideologies that set them apart from the dominant cultural or religious groups. This term encompasses the idea of a community that rejects or modifies established norms, which aligns perfectly with the provided definition of a group that holds unconventional beliefs or practices.

In contrast, a "faction" generally refers to a smaller, dissenting group within a larger organization, often based on differing opinions or interests but not necessarily focused on unconventional beliefs. A "unit" typically denotes a segment of a whole, particularly in a military or organizational context, lacking the connotation of belief systems. A "collective" signifies a group of individuals who work together or share common interests, which may or may not involve unconventional beliefs, making it less specific than "sect." Thus, "sect" is the most fitting term to describe the group in question.