This paper delves into the impact of the Covid-19 pandemic and related policies on religious attendance, with a particular focus on Catholic church attendance in the United States. The study utilizes smartphone location data from SafeGraph Inc. to track weekly religious attendance trends from 2019 through the end of 2022. This approach offers a comprehensive analysis of how attendance patterns evolved during the pandemic. Notably, the study leverages two distinctive features of the Catholic Church: its division into 175 U.S. territorial dioceses, each overseen by a bishop, and the requirement for members to attend Sunday Mass.

The study reveals several significant findings. Firstly, it highlights the dramatic decline in religious service attendance following the outbreak of Covid-19. In comparison to 2019 attendance levels, Catholic church visits lagged behind restaurants and other religious institutions throughout 2020 and 2021. However, by 2022, both Catholic and non-Catholic religious attendance had rebounded, returning to approximately 90% of their 2019 levels by October 2022. 

Secondly, the paper explores the impact of religious policies, focusing on the lifting of dispensations that temporarily exempted Catholics from the requirement to attend Sunday Mass during the pandemic. The study uncovers that dispensation lifting resulted in a 4 percentage point increase in weekend church attendance compared to the 2019 baseline. Notably, this boost was short-lived, lasting for only six weeks following the lifting of dispensations. It's worth mentioning that the effect of lifting dispensations was smaller in magnitude compared to the impact of church reopenings, which were associated with a 6 to 10 percentage point increase in attendance. 

Thirdly, the study emphasizes the lack of a significant correlation between the lifting of dispensations and changes in visits to non-Catholic religious institutions or restaurants. This suggests that the impact of dispensation lifting on church attendance was independent of other reopening events.

In the broader context, this paper contributes to the understanding of religious practice in the face of adverse events, such as natural disasters or economic crises. It distinguishes itself by using actual behavioral data, offering high-frequency insights  into the dynamics of religious practice, and benefiting from a large sample size. Additionally, the study sheds light on the impact of religious policies on individual behavior, particularly through the novel exogenous variation introduced by the lifting of dispensations in U.S. Catholic dioceses.

Furthermore, this research aligns with the broader body of literature on the effects of social distancing measures on mobility patterns. It contributes valuable insights into mobility within religious institutions, contrasting it with mobility trends in restaurants and bars.