| | Lake in the Hills, IL | Squirrel Mountain Valley, CA | United States |
| Percent Religious | 54.1% | 49.4% | 49.4% |
| Baptist | 0.9% | 3.8% | 8.2% |
| Episcopalian | 0.2% | 0.0% | 0.6% |
| Catholic | 35.5% | 30.2% | 19.7% |
| Church of Jesus Christ | 0.5% | 2.6% | 2.1% |
| Lutheran | 7.7% | 0.7% | 2.4% |
| Pentecostal | 0.6% | 3.0% | 1.9% |
| Methodist | 2.4% | 0.6% | 4.0% |
| Presbyterian | 1.8% | 0.4% | 1.7% |
| Other Christian | 2.2% | 7.1% | 6.7% |
| Judaism | 0.1% | 0.1% | 0.7% |
| Eastern | 0.0% | 0.5% | 0.5% |
| Islam | 2.2% | 0.5% | 0.9% |