Recently, there seem a significantly growing number of studies in the relationship of religion and instructional activities. In Indonesia, the world's biggest Muslim country where the big number of Islamaffiliated schools play a role in shaping the educational policy, it is considered important that teachers find a good way to take a part in delivering Islamic values while administering the instruction, particularly in the teaching of a foreign language. However, it is still found hard to find the practical and effective strategies to implement both. Moreover, not all experts say yes to include religious teachings and language pedagogy. This paper is aimed at comprehensively discussing the importance and the practices of instilling Islamic values in foreign language classroom in Indonesian context. By doing this, it is expected that the Muslim learners could both achieve the foreign language skills and, in the same time, become more aware of filtering the culture, which is irrelevant with theirs, contained in foreign language they are learning.