Forty-five percent of Americans believe the U.S. should be a “Christian nation,” one of several striking findings from a sweeping new Pew Research Center survey examining Christian nationalism. But researchers say respondents differed greatly when it came to outlining what a Christian nation should look like, suggesting a wide spectrum of beliefs. “There are a lot of Americans — 45% — who tell us they think the United States should be a Christian nation. That is a lot of people,” Greg Smith, one of the lead authors of the survey, said in an interview.