Religious (Ugama) education is a compulsory form of education apart from the mainstream education Brunei Darussalam. The Ugama schools are of autonomous management under Jabatan Pengajian Islam (JPI), a department under Brunei Ministry of Education. The classes are often conducted in a separate specified school during the weekdays and the enforced medium of instruction is the Malay language as opposed to English for the mainstream education. This research is interested in the trending application of code-switching and code-mixing in lower and upper primary level as teaching and communicating strategies employed by the teachers. The study also aims to acquire the Millennial teachers’ and Generation X teachers’ perspectives on the increasing use of the English language in Malay-medium oriented schools and its possible effects to the religious curriculum. Using in-depth interview and classroom observations as research methods, this study not only found a ‘normalized’ view on code-switching and code-mixing in lower primary level and less in upper primary level, but also majority of Generation X participants’ call for the need of formal training for English language. The Millennial participants, on the other hand, called for a move towards bilingual pedagogy for religious education to keep abreast with the mainstream education and so it could stop being viewed as secondary. The study also discovered the individual teachers’ concern for the diminishing use of the Malay language to affect the significance of religion due to the impact of cultural globalization, specifically disseminated by the internet and pop culture media. Moreover, the study also found some probable evidence of students identify English as their mother tongue, instead of Malay.