Who are the most generous givers? As a nation, America tops the charts. The three most charitable cities in America are all in Idaho. On average practicing Christians in those Idaho cities give $17,977. That beats out the giving from people in New York City, Los Angeles, and Chicago, which averages $3,308 per person.

Age also makes a big difference in giving. Eighty four percent of millennials give less than $50 to charity per year even though charitable giving ranks high on their priorities.

Today, the average church attender gives 2.5% of his or her income annually. During the Great Depression, that number was 3.3%. Thirty seven percent of those who consider themselves evangelical Christians don't give at all to their churches. Only 2.7% of evangelical Christians practice tithing.

Editor’s Note: You can read this fascinating Barna survey with all the stats here.