I have a case which would be a good example that this kind of relationship can work. A few days ago I found out that my lecturer had a mixed religion marriage, which means that he is an atheist and his wife is a catholic. Their wedding was in the church and the only exception was that she was swearing to God to love his husband, when he was swearing to her (not to God) to love her wife. They are happy together and raised two children (who are adults now). I think, that in this case, they had many things in common, they loved each other and were ready to accept their differences.
But, it is understandable that for some people it is important to have a partner of the same religion.
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