This study is academically driven by the profound necessity of reinforcing tolerance attitudes among adolescents to mitigate symptoms of social intolerance and primordial exclusivism within Indonesia's highly diverse society. Junior High School represents a vital structural stage for modifying and shaping students' socio-religious affective competencies. The central purpose of this empirical research is to investigate and scientifically analyze the extent of the positive impact and statistical significance of Islamic Religious Education (PAI) instructional quality toward students' tolerance attitudes at SMP Mahardika Bogor. Employing a causal associative quantitative architecture based on simple linear regression modeling, the research identified a macro population of 248 active students, from which a representative sample of 181 students was extracted using proportional distribution procedures. Primary data acquisition was executed using closedended, structured 4-point Likert scale questionnaires to minimize psychological response biases. Prior to hypothesis checking, dataset parameters were subjected to formal diagnostics utilizing the Kolmogorov-Smirnov normality method. Inferential parameters were processed utilizing simple linear regression frameworks executed via SPSS version 26 software. Descriptive analytics validated that the standard of Islamic Religious Education implementation at the school resides securely within an optimal and high category. The partial t-test statistical computation generated a t of 10.493, value which substantially exceeds the theoretical t threshold of 1.973 under d.f = 179, yielding an exact significance table coefficient of 0.000 < 0.05. Consequently, the Null Hypothesis (H ) is formally rejected, and the Alternative Hypothesis 0 (H ) is validated. The coefficient of determination R Square reached 0.381, demonstrating that the PAI instructional quality 1 provides a 38.1% effective predictive contribution toward students' social tolerance variances, while the remaining 61.9% is governed by external socio-ecological variables outside the current regression paradigm. In conclusion, Islamic Religious Education instruction exerts a significantly positive and predictive influence on shaping and expanding students' tolerance attitudes at SMP Mahardika Bogor.
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