Missionaries have always held a heroic and romantic place within the Christian imagination. Even today churches regularly collect contributions for the mission field. The reality, of course, is very different. From its very beginnings, Christian missionaries have inflicted tremendous harm on the peoples they "witnessed" to.
In the past, the damage done by missionaries were shared equally between the Protestant and Catholic churches. Today, most of the damage is done by fundamentalist, pentacostal and evangelical protestant sects, mostly from the US, Canada and Europe. Numbering about 80,000 strong [1] these fundamentalist missionaries spread like locusts throughout the world. Their destruction of native cultures, and in some cases actually causing the deaths of these natives, can only be described as a modern cultural and genocidal holocaust.
http://www.rejectionofpascalswager.net/mission.html