Archbishop of Canterbury Rowan Williams, while speaking recently to a conference on development addressed the complicated issues related to the relationship between proselytizing religious groups and emergency relief agencies. 

He was speaking at a seminar on faith and development, organised by the Tony Blair Faith Foundation in association with the Royal Society of Arts. It was chaired by Rabbi David Rosen.

Williams
said the fact these risks were “sometimes exaggerated” and were used as
grounds for rejecting the whole idea of partnership with religious
bodies “should not blind us to the fact that the dangers are perfectly
real”.

The entire UK Guardian Article   captures the subtleties and issues well.