If christians can marry non christians explain this page?

Some fundie said that all marriages between a man and a woman are acceptable by god, well here is what HER bible says about it. "Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial? Or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? For ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people. Wherefore come out from among them, and be ye separate, says the Lord, and touch not the unclean thing; and I will receive, and will be a Father unto you, and ye shall be my sons and daughters, says the Lord Almighty" (II Cor. 6:14-18).