Cultural Diffusion: The spread or transmission of cultural elements (ideas beliefs customs etc.) from one society or region to another usually through migration trade conquest or technological advancement.
Religious Syncretism: The blending or combination of different religious beliefs and practices resulting in the emergence of new religious traditions or the modification of existing ones. It often occurs when two or more cultures come into contact with each other.
Cultural Assimilation: The process by which individuals or groups adopt and absorb the cultural traits (language customs values etc.) of another society usually due to social pressure or political dominance.