BackgroundIn the United Kingdom, onsite religious services were halted during COVID-19 lockdowns, which were followed by various levels of restrictions on communal worship including social distancing, mandatory wearing of face masks, adequate ventilation and a ban on congregational singing and chanting. The aim of our study was to evaluate the impact of closures and changes within places of worship in response to the first lockdown in 2020, to assess the effect of the pandemic on religious practice and worshippers’ wellbeing and religious coping. MethodsParticipants were regular worshippers in the UK, recruited through an online survey using convenience sampling. Respondents were asked about their attitudes to changes to places of worship in the UK and their wellbeing and mental health, including assessment of their risk of depression and anxiety using the Patient Health Questionnaire (PHQ-9) and Generalised Anxiety Disorder Assessment (GAD-7) measures. Questionnaires were completed August to November 2020. Findings939 participants were included in the analysis. Median age was 52.7 years and 66.1% were female. 80.7% identified as Christian. 165 (19.3%) had mild, 45 (5.3%) moderate, 25 (2.9%) moderately severe and 10 (1.2%) severe depression, and 192 (22.5%) had mild, 55 (6.4%) moderate and 27 (3.2%) severe anxiety, according to PHQ-9 and GAD-7 scores, respectively. Nearly half (46.4%) reported that their mood and anxiety levels had worsened and 16.6% reported that they felt the things they were doing in their lives were not worthwhile. The vast majority of respondents (92.7%) reported that prayer had helped them cope with the way they had felt during lockdown: 29.2% and 47.0% reported that it helped moderately and a great deal, respectively. This 76.2% had significantly lower levels of moderate/severe depression and anxiety (adjusted odds ratio: depression 0.37 (95%CI 0.22-0.63), anxiety 0.52 (95%CI 0.31-0.88). InterpretationOur study demonstrates the significant impact of COVID-19 on communal worshippers’ mental health and reinforces the benefits of positive religious coping during the first UK lockdown. Barriers to communal worship participation during lockdowns, including access to appropriate technology, need to be recognised and facilitators identified.