The purpose of this article is to capture how religiosity is sociologically researched. On the basis of a bibliographical research, the particularities of quantitative, qualitative and mixed methodological approaches to this topic are highlighted. Each method used enhances a different dimension of religiosity. In studying the religious phenomenon, it is found that there are certain limitations that the researcher must take into account. Its working data also include spiritual values, which legitimise how research participants relate to the phenomenon. In turn, the researcher has his own relationship to religiosity.