Something else I see too much of is this whole "you're destined to meet the person of your dreams," or, "isn't it an amazing coincidence that we met at [uncertain place]?" This carries with it some implication of fate, which only is possible if 1) Some entity set everything into motion, 2) Said entity guides everything that happens, and 3) Free will doesn't exist.
Think of how many people you may interact with on any given day, especially if you go to some big social function. Think about how many of those people you didn't wind up dating and marrying.