And the woman which hath an husband that believeth not, and if he be pleased to dwell with her, let her not leave him.
For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband.".
According to the scriptures, relationships are very important, and faith does matter.
After all, faith lays the foundation for your world-views, and world-views will control how you see and respond to the world, and that includes relationships.
I personally believe that the telling word here is "unequally" -- certainly a Christian should never submit his or her belief to that of the non believer.