Christians make up 33% of the world population (http://www.adherents.com/Religions_By_Adherents.html)
It would be hard to generalize for such a diverse group.
Since Christianity teaches that we are all sinners in need of forgiveness, it would be hard to focus on this teaching and be considered a hypocrite.
Christianity always helped or was not a factor in a decline.
Here are a few Christians who led in science
Copernicus, the first astronomer of the scientific revolution
Galileo - laws of dynamics from observation of falling bodies
Kepler - laws of planetary motion
Newton, involved in distribution of Bibles to the poor and the construction of new churches. He actually wrote more than a million words on the Bible and theological topics, more than he wrote on science.
According to 100 Years of Nobel Prizes a review of Nobel prizes award between 1901 and 2000 reveals that (65.4%) of Nobel Prizes Laureates are Christian.
Having an economist help set policy is a good idea.
Experience in a world leader is a great idea.
Very few in the current Liberal or NDP have experience in power.
The Green party and the Bloc frighten me with their narrow focus.