| | Buchanan Lake Village, TX | Austin, TX | United States |
| Percent Religious | 44.4% | 52.4% | 49.4% |
| Baptist | 20.6% | 8.7% | 8.2% |
| Episcopalian | 0.6% | 1.0% | 0.6% |
| Catholic | 7.4% | 25.2% | 19.7% |
| Church of Jesus Christ | 0.0% | 1.5% | 2.1% |
| Lutheran | 2.2% | 0.8% | 2.4% |
| Pentecostal | 0.2% | 0.3% | 1.9% |
| Methodist | 6.9% | 4.3% | 4.0% |
| Presbyterian | 0.1% | 0.6% | 1.7% |
| Other Christian | 6.5% | 7.1% | 6.7% |
| Judaism | 0.0% | 0.0% | 0.7% |
| Eastern | 0.0% | 0.9% | 0.5% |
| Islam | 0.0% | 1.7% | 0.9% |