Religion – Numbers (2021)
| Croydon | England | London | |
| Total: All usual residents | 390,719 | 56,490,048 | 8,799,728 |
| No religion | 101,119 | 20,715,664 | 2,380,404 |
| Christian | 190,880 | 26,167,899 | 3,577,681 |
| Buddhist | 2,371 | 262,433 | 77,425 |
| Hindu | 23,145 | 1,020,533 | 453,034 |
| Jewish | 609 | 269,283 | 145,466 |
| Muslim | 40,717 | 3,801,186 | 1,318,754 |
| Sikh | 1,654 | 520,092 | 144,543 |
| Other religion | 3,189 | 332,410 | 86,759 |
| Not answered | 27,035 | 3,400,548 | 615,662 |
Source : ONS, Census 2021.
Religion – Percentages (2021)
| Croydon | London | England | |
| Total: All usual residents | 100% | 100% | 100% |
| Christian | 48.9% | 40.7% | 46.3% |
| No religion | 25.9% | 27.1% | 36.7% |
| Muslim | 10.4% | 15.0% | 6.7% |
| Hindu | 5.9% | 5.1% | 1.8% |
| Sikh | 0.4% | 1.6% | 0.9% |
| Jewish | 0.2% | 1.7% | 0.5% |
| Buddhist | 0.6% | 0.9% | 0.5% |
| Other religion | 0.8% | 1.0% | 0.6% |
| Not answered | 6.9% | 7.0% | 6.0% |
Source : ONS, Census 2021.