Politifact reports on America, a country that wasn't founded by many Jews, Muslims, or Catholics.
The Heritage Foundation reports:
In 1776, every European American, with the exception of about 2,500 Jews, identified himself or herself as a Christian. Moreover, approximately 98 percent of the colonists were Protestants, with the remaining 1.9 percent being Roman Catholics.
There's more:
In 1775, at least nine of the 13 colonies had established churches. Although establishments took a variety of forms, they generally entailed the state providing favorable treatment for one denomination—treatment which often included financial support. Members of religious denominations other than the official established church were usually tolerated, but they were occasionally taxed to support the state church, and some were not permitted to hold civic office.
No word yet on this blog entry from Barack Obama.