An optimistic reading of this poll would indicate that familiarity with people of other churches reduces suspicion and hostility. It shows people in countries near the Catholic-Orthodox borders much more willing to consider mixed marriages than people in regions where one faith strongly predominates. 

But more realistically it probably just shows that religious scruple is popular only until it begins restricting the marriage market. If the only unmarried Catholic in town is a bald bankrupt drunk, Orthodox men don't seem so bad.