Religion has always been argued as a cultural factor that influences behavior. Similarly, previous studies had shown that demographic factors such as age, gender, education level, and work experience were linked to behavior. This present study examined if demographic factors and religiosity dimensions could predict ethical behavior, specifically Islamic ethical work behavior, in Brunei. This study used an existing data set, which had been employed with a different approach and research questions. A total of 370 respondents were analyzed. Model analysis involved the use of binomial logistic regression. It correctly classified 77% of cases. The result showed that demographic factors were not significant predictors of Islamic ethical work behavior. However, all religiosity dimensions were significant predictors of Islamic ethical work behavior, providing support for religion influencing behavior in the workplace—to a certain extent, in the society—although the degree of effects varied, suggesting opportunities for further research. The findings were discussed, and limitations and recommendations were then presented.