This paper discusses the Islamization of Suku Anak Dalam (Jambi’s people of the jungle/the SAD) in Jambi as well as proves that the Islamization has moved from the realm of aqidah to the deepening of fiqh, especially fiqh al-ṣalāh, unlike previous researchers’ accusations who generalized that animism is still attached to the the SAD who have converted to Islam. This paper applies field study principles combining qualitative and quantitative research methods by applying sociocultural anthropology theory, with a research object being the SAD residing in Pelempang Village, Muaro Jambi. This paper concludes that SAD’s Islamization has succeeded in removing animist teachings that are not in line with Islamic values. However, SAD’s understanding of fiqh al-ṣalāh is still relatively low. This is due to a low level of education, inability to read and write, remote geographical locations, barriers between the SAD and other residents, and the absence of teachers of fiqh al-ṣalāh who teach actively and consistently in the area.