The article analyzes the factors contributing to the growth of religious extremism in Malaysia on the basis of a qualitative and quantitative method using data from social surveys collected in KL, expert interviews and secondary literature. It identifies external and internal factors that contribute to the spread of extremist understanding of religion, including the influence of colonial rule, foreign invasions, politicization of religion and globalization. The study determines that extremism destroys public well-being and national security; Thus, any extremist ideas and behaviors must be eradicated.