Such elements as culture, human psychology, social psychology in association with socioeconomic conditions and history context were the necessary and adequate conditions for a birth of a religion. These social factors were also the reasons of the emergence and development of indigenous religions in the South of Vietnam, including Buu Son Ky Huong, Tu An Hieu Nghia, and Hoa Hao Buddhism. These religions have their specific characteristics of tenets, dogmas, and religious guidelines, but generally, they have dialectical relations in a complex interaction with each other. This article aims to analyze the similarities and differences among Buu Son Ky Huong, Tu An Hieu Nghia, and Hoa Hao Buddhism, then clarify the aforementioned dialectical relation