I would presume the Mormon church was looking for converts among the atheists, if I didn't know better.
Another difference between Mormon prosyletism and Catholic outreach is significant here: The Catholic Church does not hold that the Orthodox Church is defective for salvation; Mormons, on the other hand, have been known (by me, personally) to evangelize by destroying incumbent faith. (In fairness, they are far from the worst. So many Protestant churches' "outreach" is purely an assault on Catholic beliefs and anti-Catholic straw-man fallacies.)
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There does seem to be a difference between Catholics and Protestants in the approach each takes when posting on one of the religion threads.