I do not see a question, but I wonder if you are looking for an explanation of this quote.
This quote is talking about how colonization affects the societies that are colonized. It is also commenting on the motives of the colonizers.
One stated goal of European and American colonization has been to spread the "true" religion to others. You would think that this would mean that they would also act in Christian ways. This quote is saying that they did not act in Christian ways. Instead, the took everything they could. The natives ended up with Christianity, but the colonizers took everything of value.
In Hawaii there was a similar saying that the missionaries found the islands in "darkness" and left them "lighter" because they stole everything that wasn't nailed down.