The aim of this thesis was to test whether the protestant faith or the protestant tradition is the cause of the protestant suppressive effect on corruption and whether this effect prevails on an individual level. This was done using multilevel hierarchical regression models and over 350 000 survey questionnaires to avoid bias as well as national and cultural effects. This thesis shows that identifying oneself as protestant has a significant effect on ones tolerance of corruption, but this effect is severely reduced when controlling for socioeconomic and political factors. We further show that the level of religiosity is a relevant predictor in individual tolerance for corruption for protestants. The individual religious identity is, however, not as strong a predictor as documented aggregated levels of Protestantism, indicating that, while still relevant, national factors are more important in explaining variation in corruption. / <p>2019-06-04</p>