| | Montgomery township (Montgomery County), PA | Arlington, VA | United States |
| Percent Religious | 64.3% | 32.8% | 49.4% |
| Baptist | 2.0% | 4.1% | 8.2% |
| Episcopalian | 1.7% | 2.1% | 0.6% |
| Catholic | 38.5% | 15.4% | 19.7% |
| Church of Jesus Christ | 0.4% | 0.9% | 2.1% |
| Lutheran | 4.8% | 0.9% | 2.4% |
| Pentecostal | 0.5% | 0.3% | 1.9% |
| Methodist | 2.1% | 3.4% | 4.0% |
| Presbyterian | 3.8% | 1.2% | 1.7% |
| Other Christian | 5.5% | 1.8% | 6.7% |
| Judaism | 4.3% | 0.2% | 0.7% |
| Eastern | 0.4% | 0.0% | 0.5% |
| Islam | 0.4% | 1.7% | 0.9% |