Economics and religion overlap because both deal with people. Austrian economics is the most Christian of the schools of economics partly because its view of people, time, and money fit Christianity like a glove. This is true, although the greatest economists of the Austrian school in the 20th century -- F.A. Hayek and Ludwig von Mises -- were agnostics. Mises may have become a Christian late in life.
Another argument for the Christian origins of Austrian economics is that the school can trace its genesis back to the Godly theologians associated with the University of Salamanca, Spain, in the 16th and 17th centuries. Church fathers in the early years of Christianity had embraced the economics of Aristotle and Cicero rather than that of the Bible. Their reasons for doing so have been lost, but it may have been due to the tendency of churches suffering persecution to elect young converts from the nobility as bishops because they enjoyed political power. The sons of nobility had a high regard for the great philosophers of antiquity and tended to baptize their economics.
