PurposeThis study aims to examine the decision-making behaviour of Islamic banking practitioners of the United Arab Emirates with special reference to the operational line heterogeneity by employing factors that are religious in nature such as intellect, satanic force and divine knowledge as encapsulated in al-Ghazali’s ethical philosophy.Design/methodology/approachA total of 337 samples were collected from the Islamic banking practitioners in the United Arab Emirates using a purposive sampling technique, and the empirical analysis was conducted with the measures of model fit and bootstrapping technique using Partial least square Structural equation modelling and multi-group analysis.FindingsThe empirical findings reveal that the dedicated use of intellect in making decisions related to ethical issues where desires and emotions tend to overwhelm reason and human choices. While divine knowledge is found ineffective guidance of the intellect, the element of satanic force is found significantly impacting decision-making. As the lack of religious consciousness is evident among respondents, higher exposure to operational risk is expected. These findings were found identical across the Islamic banking practitioners in different lines of operations.Research limitations/implicationsThe span of the study is limited to a single country. Future studies are recommended to replicate the study to more markets where the share of Islamic finance is significant.Practical implicationsFindings of the study highly suggest respective authorities of Islamic financial institutions to intensify the capacity-building programs on the foundation of faith which includes Islamic thought and worldview, to enhance the corporate ethical decision-making. Moreover, equal importance should be given to all the banking practitioners regardless of line of business operations.Originality/valueWith undue emphasis is given to the juristic (fiqh) aspects of Shariah compliance in the Islamic banking and finance industry, less has been attempted to explore its ethical dimension (akhlaq) in the compliance parameters that leave a relatively large gap to address prevailing unethical practices in Islamic finance institutions. Findings from this study can be useful as a warning to the Islamic banking firms to enhance the sense of God-fearing and improve existing measures in the organisation in mitigating operational risks that may arise from people or system and consequently ensure the smooth governance of the Islamic banks.