The Pew Research Center has released a report on a new study on religion and Americans' lives. The overview is here, and the complete report in pdf is here.
Several findings are reported. For example, religious adults report higher levels of happiness, volunteer and donate more money, time, and goods to the poor. Higher religious persons do differ very much from other Americans when it comes to losing their tempers, being satisfied with their health, and recycling.
Many other findings are also reported, and the overview cited above provides a nice review.