And see, these are the groups that I know. I grew up in the Methodist Church, and have been a United Methodist pastor for 28 years. Plus, for 4 years of that time, I served a Lutheran congregation. And while I can point to plenty of problems with both churches, missionaries bribing people is not a story I am familiar with inside either denomination.
Indeed, my only knowledge of United Methodist contact with Muslims came when my (AFS exchange) daughter Asli came to live with us. Just a few years before her community had been hit hard by a terrible earthquake and she had lost her home. The first emergency housing they had were tents with the name UMCOR stampped on the boxes they came out of. She knew this because her father was the mayor in the town, and thus it was through him that the tents were distributed. She had know idea what UMCOR meant or was about until we were talking about it one day and she said that she just knew it had something to do with a church in the USA. Well, I was able to tell her that UMCOR was a part of my United Methodist Church and stood for United Methodist Committee on Relief. Until that moment in our house, she had never meant anyone who could even make the connection for her.
UMCOR is involved in many places around the world doing both emergency relief efforts and long term efforts to make life more sustainable. And in those cases of long-term aid, we do not hesistate to share the gospel as we do our other ministries. But never is there the attempt to "buy" Christian conversions. As you point out Woodrow, unless the people are genuine in desiring to live as a Christian, they will eventually abandon it. So, we do the work, love the people and (where we have ongoing relationships) share the gospel. But to my knowledge (though I admit I have never been to Africa), never do we engage in the sort of subtrefuge that Marwen asked about at the beginning of this thread.