Christian missionaries make no secret of the fact that they use medical services, education, and employment opportunities to lure impoverished indigenous populations throughout the world into conversion to Christianity.
According to the popular and scholarly history of Christianity, the early Christian Church found its greatest appeal and attracted its greatest number of converts from the poor people of the Roman Empire. The early Christian churches raised money through a tithe, or ten per cent income tax, levied on their members, and the early Christian church is said to have had a strong 'sense of community', which implies that it had a well-organized social, financial, and political network among its membership.
Using your wealth to purchase other people's loyalty is a game as old as humanity itself. Rich men use their wealth to attract women, unscrupulous employers use material incentives and disincentives to manipulate their workers, and wealthy countries like the USA use their national wealth to keep their citizens loyal to the cause of aggressive and genocidal Imperialism. But historical longevity and common practice don't make the manipulation or exploitation morally or ethically right.
Organized religions are inherently POLITICAL organizations. There is a fundamental difference between the financial enterprise and political machinations of an organized religion versus a mass of independent, unaffiliated believers, philosophers, and mystics who do not support any organized religion.
Christianity and Islam are known as proselytizing religions because they make an organized and systematic effort to gain converts, and they often provide services, products, or employment to attract converts. Judaism, Hinduism, and Buddhism show far less zeal about gaining converts, which is why you almost never hear about Jewish, Hindu, or Buddhist missionaries.
Modern medical and nursing schools usually teach their students the moral principle that the provision of medical services should never be used as a means to proselytize or promote a religion, but that does not deter many Christian health care providers from doing exactly that. Most of the medical and charitable organizations based in Christian countries are fronts for Christian proselytizing activities.
One of the largest international medical relief organizations based in the USA, Northwest Medical Teams, states in their recruitment brochure that their chief 'mission' is to 'spread the Gospel of Jesus Christ', that their medical relief services are subordinate to their stated goal of proselytizing Christianity, and that their medical relief work is merely an 'aegis', or facade, for spreading Christianity.