The highest standard of living and the most freedoms are enjoyed by those nations which are demonstrably Judeo/Christian, both in history and presently.
This fear that we'd go back to barbarism is totally unfounded. Science has much more to fear from atheistic thinking and politics that it ever did from Christian thinking and politics.
Christian thinking and politics gave us the nation we have today. Going back to those days, when our country was at its greatest, couldn't happen soon enough.
"During almost fifteen centuries has the legal establishment of Christianity been on trial. What have been its fruits? More or less in all places, pride and indolence in the Clergy, ignorance and servility in the laity, in both, superstition, bigotry and persecution."
James Madison, Memorial and Remonstrance against Religious Assessments
20 June 1785
http://press-pubs.uchicago.edu/founders/documents/amendI_religions43.html