Keith,
See the link in my signature for setting your signature in your profile.
As to the question, the original Westminster Confession of Faith says*:
III. It is lawful for all sorts of people to marry, who are able with judgment to give their consent.5 Yet it is the duty of Christians to marry only in the Lord.6 And therefore such as profess the true reformed religion should not marry with infidels, papists, or other idolaters: neither should such as are godly be unequally yoked, by marrying with such as are notoriously wicked in their life, or maintain damnable heresies.7
[5] HEB 13:4 Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge. 1TI 4:3 Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth. 1CO 7:36 But if any man think that he behaveth himself uncomely toward his virgin, if she pass the flower of her age, and need so require, let him do what he will, he sinneth not: let them marry. 37 Nevertheless he that standeth stedfast in his heart, having no necessity, but hath power over his own will, and hath so decreed in his heart that he will keep his virgin, doeth well. 38 So then he that giveth her in marriage doeth well; but he that giveth her not in marriage doeth better. GEN 24:57 And they said, We will call the damsel, and inquire at her mouth.
[6] 1CO 7:39 The wife is bound by the law as long as her husband liveth; but if her husband be dead, she is at liberty to be married to whom she will; only in the Lord.
[7] GEN 34:14 And they said unto them, We cannot do this thing, to give our sister to one that is uncircumcised; for that were a reproach unto us. EXO 34:16 And thou take of their daughters unto thy sons, and their daughters go a whoring after their gods, and make thy sons go a whoring after their gods. DEU 7:3 Neither shalt thou make marriages with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son. 4 For they will turn away thy son from following me, that they may serve other gods: so will the anger of the Lord be kindled against you, and destroy thee suddenly. 1KI 11:4 For it came to pass, when Solomon was old, that his wives turned away his heart after other gods: and his heart was not perfect with the Lord his God, as was the heart of David his father. NEH 13:25 And I contended with them, and cursed them, and smote certain of them, and plucked off their hair, and made them swear by God, saying, Ye shall not give your daughters unto their sons, nor take their daughters unto your sons, or for yourselves. 26 Did not Solomon king of Israel sin by these things? yet among many nations was there no king like him, who was beloved of his God, and God made him king over all Israel: nevertheless even him did outlandish women cause to sin. 27 Shall we then hearken unto you to do all this great evil, to transgress against our God in marrying strange wives? MAL 2:11 Judah hath dealt treacherously, and an abomination is committed in Israel and in Jerusalem; for Judah hath profaned the holiness of the Lord which he loved, and hath married the daughter of a strange god. 12 The Lord will cut off the man that doeth this, the master and the scholar, out of the tabernacles of Jacob, and him that offereth an offering unto the Lord of hosts. 2CO 6:14 Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?
*cut and paste from reformed.org; not checked for accuracy.
