defy God and marry an unbeliever. Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? or what part hath he that believeth with an infidel? Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing.
Ugh. This thing was a huge part of my high school and 20s. But I did it anyway and they didn't disfellowship. They made their disapproval known though.