Well, it absolutely affected its expansion, making it more of a philosophical and ethical system rather than a structured, missionary-driven religion like Christianity, Islam, or Buddhism. Here’s why:
No Institutionalized Clergy = No Missionaries
Religions that spread far and wide typically have priests, monks, or missionaries to actively recruit and convert followers (e.g., Catholic priests, Buddhist monks, Islamic imams).
Confucianism lacks a centralized religious hierarchy, meaning it never had an organized missionary class to push its values onto new populations.
Instead, it spread indirectly through education, governance, and cultural influence rather than conquest or conversion.