persecution often involves human rights abuses.
Everyone has the right to seek asylum from persecution. from Article 14, UDHR.
Furthermore, Article 2 UDHR prohibits discrimination on the following 10 grounds: race, colour, sex, language, religion, political or other opinion, national or social origin, [...]
meaning that if you don't persecute that hypothetic Nissan sales agent for desperately wanting to sell his product... you should not persecut Christians who proselyte, either. Non-discrimination, please.