Encountering superstitions you do not share is part of living abroad, and the graceful response is respect without pretense. You are never required to believe, only to avoid mocking. If a colleague will not sign a contract on an inauspicious day, a host rearranges seating for luck, or a neighbor performs a ritual before you move into a flat, the courteous move is to go along with harmless practices or step aside quietly from ones you would rather not join.
Useful phrases exist in every language for this: that is interesting, tell me more about it. Genuine curiosity converts an awkward moment into a bonding one, because most people enjoy explaining traditions to a respectful outsider. What damages relationships is laughing, debunking or filming rituals as curiosities.
Where it gets more delicate is when a superstition affects you directly, like pressure to participate in a religious act against your own convictions. A warm, brief explanation that you respect the tradition but follow your own beliefs is accepted almost everywhere. Draw the line politely, thank people for including you, and move on.