South Korea's rapid economic growth in the 1960s and 1970s is usually credited to the policy of export-oriented industrialization led by Park Chung-hee (박정희), who was a devout Buddhist. But many South Korean Christians view their religious faith as a factor in the country's dramatic economic growth over the past three decades, believing that its success and prosperity are indications of God's blessing. It is, of course, difficult to isolate this factor from the effects of other influences such as indigenous cultural values and work ethic, a strong alliance with the United States, and the infusion of foreign capital.
A 2003 study by economists Robert J. Barro and Rachel McCleary  suggests that societies with high levels of belief in heaven and low levels of church attendance also exhibit high rates of economic growth. Barro and McCleary's model has been influential in subsequent scholarship and, to some observers  , it supports the belief that Christianity has played a major role in South Korea's economic success.
The study has also been criticised by scholars such as Durlauf, Kortellos, and Tan (2006), who argue on statistical grounds that there is little evidence connecting religion and economic growth either directly or indirectly. 
The confidence of South Korean Christians in the social and economic benefits of their faith has been a factor in the spread of Christianity in South Korea. There is much appreciation in South Korea for the statistical growth, impressive organization, and attractive buildings  of many Christian groups. People quite naturally want to associate themselves with prosperity and success, and insofar as they see Christianity as the source of those things, they will be more likely to accept it as an important influence in their lives.
Christianity in Korea - Wikipedia, the free encyclopedia