[header] How to make an atheist and theist relationship work [title] Keep communication open. [step] If your difference in perspective causes friction between you, don't let it bubble away silently. As with any tension in a relationship, it's unlikely to disappear if you don't address it openly. 
Once in a while, something you say will upset your partner, or vice versa. Talk to each other so you both understand why it was upsetting, and what the intent was behind the words.