What I'm saying is that most interfaith relationships, assuming you mean spousal relationships, should not be entered into if they are not compatable. [Some interdenominational Christian or Judeo-Christian relationships could work.] Mark 3:25 adds, "And if a house be divided against itself, that house cannot stand." Of course, if one is alredy in such a relationship, the applicable script is 1 Corinthians 7:12b-16, "If any brother hath a wife that believeth not, and she be pleased to dwell with him, let him not put her away.  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: else were your children unclean; but now are they holy. But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God hath called us to peace. For what knowest thou, O wife, whether thou shalt save thy husband? or how knowest thou, O man, whether thou shalt save thy wife?" :D