Original sentence: Buddhists are mostly nominal adherents because only a small proportion of the population (over 8% or over 100 million ) may have taken the formal step of going for refuge.The majority of Chinese people follow Buddhism (between 660 million, 50%, and over 1 billion, 80%) and/or Taoism (400 million, 30%)
Edited sentence: The majority of Chinese people follow Buddhism (between 660 million, 50%, and over 1 billion, 80%) and/or Taoism (400 million, 30%); and they are mostly secular/nominal adherents because only a small proportion of the population (over 8% or over 100 million ) may have taken the formal step of going for refuge.The number of adherents to these religions is uncertain, since some Chinese consider themselves both Buddhist and Taoist and since many people regard Buddhism and Taoism more as a part of their traditional spiritual culture than as true religions