Muslim religiosity is often portrayed as a barrier to integration into secular societies, especially in Europe. Scholars suggest that religiously segregated networks reinforce Muslims’ religiosity and religious identification, but solid evidence is scarce. Based on longitudinal German data, we examined whether friendship networks influence Muslim youths’ religiosity. Using stochastic actor-oriented models, we also assessed whether religiosity in turn relates to friendship choices. We found that higher shares of Muslim friends neither increase Muslim youths’ religious identification nor their frequency of prayer, but they are associated with more frequent mosque attendance. Furthermore, Muslim youths assimilated their Muslim friends’ mosque attendance and frequency of prayer. Friends’ actual religious practices, rather than shared group membership, thus seems to shape individual religiosity. Finally, religiosity does not hamper interreligious friendships; it was unrelated to friendship choices. Results are similar for Christian youths, suggesting that these patterns are not unique to Muslims.

穆斯林的宗教信仰经常被描绘成融入世俗社会的障碍，尤其是在欧洲。学者认为，宗教隔离的网络加强了穆斯林的宗教信仰和宗教认同，但缺乏确凿的证据。根据德国的纵向数据，我们检查了友谊网络是否影响穆斯林青年的宗教信仰。使用面向随机演员的模型，我们还评估了宗教信仰是否又与友谊选择有关。我们发现，穆斯林朋友的比例较高，既不会增加穆斯林青年的宗教认同感，也不会增加他们祈祷的频率，但它们会导致清真寺出勤率增加。此外，穆斯林青年同化了穆斯林朋友的清真寺出席率和祈祷频率。朋友的实际宗教习惯，而不是共同的团体成员，因此似乎在塑造个人的宗教信仰。最后，宗教信仰并不会妨碍宗教之间的友谊。这与友谊的选择无关。基督教青年的结果相似，表明这些模式并非穆斯林所独有。