Missionary

a person sent on a religious mission, especially one sent to promote Christianity in a foreign country.

Via: Singapore’s former Prime Minister, Lee Kuan Yew, once said: https://x.com/Lotus_indrajit/status/1984951611781947401

• “Missionaries did their best to convert India, China, and Indonesia to Christianity, but they managed to change only a very small number of people. Their plan failed.”