He often tries to proselytise to strangers in the park, attempting to convert them to his faith.

proselytise 是动词，意思是"劝人改变宗教信仰"或"使人皈依"。这个词源自希腊语"proselytos"，原指"新来者"或"皈依者"。 proselytise 通常带有贬义色彩，暗示强迫或过度热情地劝说他人改变信仰的行为。