This study aims to design an educational package based on constructivism to teach the concept of the names of God in Surah Al-Hamd and Tawhid and to examine its effectiveness on students' perception of God. The design of this research is quasi-experimental with experimental and control groups with pre-test and post-test. For this purpose, 30 eighth grade high school students in Ashkezar city were selected by available sampling method and placed in two experimental and control groups and a monotheistic education package was implemented in 8 sessions for the experimental group. Research data were collected using items related to the perception of God from the Religious Status Inventory (RSI) and analyzed using analysis of covariance. The findings showed that teaching the concept of the names of God in Surah Al-Hamd and Tawhid based on constructivism is effective in students' perception of God and positive perception of it.