| | Montgomery township (Montgomery County), PA | Allentown, PA | United States |
| Percent Religious | 64.3% | 51.3% | 49.4% |
| Baptist | 2.0% | 0.4% | 8.2% |
| Episcopalian | 1.7% | 0.4% | 0.6% |
| Catholic | 38.5% | 20.6% | 19.7% |
| Church of Jesus Christ | 0.4% | 0.5% | 2.1% |
| Lutheran | 4.8% | 8.4% | 2.4% |
| Pentecostal | 0.5% | 0.5% | 1.9% |
| Methodist | 2.1% | 3.1% | 4.0% |
| Presbyterian | 3.8% | 7.8% | 1.7% |
| Other Christian | 5.5% | 4.4% | 6.7% |
| Judaism | 4.3% | 1.0% | 0.7% |
| Eastern | 0.4% | 3.3% | 0.5% |
| Islam | 0.4% | 0.9% | 0.9% |