Distribution (in percentage) of religious groups, Saint-Guillaume (Municipalité), 2021
| Religious groups | 2021 |
|---|---|
| Buddhist | 0.0 |
| Anglican | 0.0 |
| Baptist | 0.0 |
| Catholic | 73.2 |
| Christian Orthodox | 0.0 |
| Lutheran | 0.0 |
| Pentecostal and other Charismatic | 0.0 |
| Presbyterian | 0.0 |
| United Church | 0.0 |
| Other - Christians | 3.8 |
| Hindu | 0.0 |
| Jewish | 0.0 |
| Muslim | 0.0 |
| Sikh | 0.0 |
| Traditional (North American Indigenous) spirituality | 0.0 |
| Other religions and spiritual traditions | 0.0 |
| No religion and secular perspectives | 22.3 |
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