Antonyms for "most unsectarian" would include "bigoted," "narrow-minded," "dogmatic," "sectarian," and "intolerant." These words refer to an individual or group that is biased towards their own beliefs, values, or traditions and is unwilling to consider alternative viewpoints or beliefs. A person who is "most unsectarian" seeks to be inclusive, tolerant, and open-minded towards all beliefs or viewpoints while respecting the diversity of cultures and religions. The opposite of this would be an individual who discriminates against others due to their beliefs or traditions, ultimately damaging the fabric of society and the principles of human rights.