What is God's will about marriage?

“However, his father and mother did not know that it was of the LORD, for He was seeking an occasion against the Philistines.  Now at that time the Philistines were ruling over Israel” (Judges 14: 4).

            Should we Christians be married only to Christians who believe in Jesus?  Although he or she does not believe in Jesus now, can I marry and witness him/her?

            Today, in verse 14: 4, the Bible says that Samson's parents “did not know it was of the LORD.”  Here, what does "it" refer to?  It refers to “Samson went down to Timnah and saw a woman in Timnah, one of the daughters of the Philistines.  So he came back and told his father and mother, ‘I saw a woman in Timnah …; now therefore, get her for me as a wife” (vv. 1-2).  In other words, what Samson's parents did not know was that Samson was trying to make the Philistine woman as his wife.  So Samson's parents said to Samson when he wanted to take the woman of the Philistines as wife: “Is there no woman among the daughters of your relatives, or among all our people, that you go to take a wife from the uncircumcised Philistines?” (v. 3)  In Samson's parents' perspective, I think that they could speak to their son whom they loved.  In particular, they knew that the angel of the Lord appeared to the Samson’s mother and said she would conceive and would give birth to a son (13:3) and he would be a Nazirite to God from the womb (vv. 5, 7).  So her husband Manoah, the Samson’s father, asked the Lord to teach them what to do for the boy who was to be born: “O LORD, I beg you, let the man of God you sent to us come again to teach us how to bring up the boy who is to be born” (v. 8), “When your words are fulfilled, what is to be the rule for the boy's life and work?” (v. 12)  And they would certainly have kept Samson from drinking wine or other fermented drink, not letting him anything unclean, and no razor was used on his head (vv. 4-5, 7, 14).  But what would the parent's heart be like when their beloved son Samson who was so nurtured best said he would marry a Philistine woman?  Surely they could say to Samson, “Isn't there an acceptable woman among your relatives or among all our people? Must you go to the uncircumcised Philistines to get a wife?” (14: 3)  But the Bible says that “this was from the LORD” (v.4).  How should we understand this?  Did God really make Samson, the Nazirite, marry a Philistine woman?  How could the holy God make Samson, the Nazirite, to marry to the Gentile woman?  I think not.  In other words, it was not God made Samson to marry the Philistine woman, but He allowed him to marry her.  It means that God allowed the marriage of Samson and the Philistine woman which was the Samson’s choice but God did not pair them.  That was how much God loved Samson.  God who respected Samson's free will had allowed him to marry the Gentile woman who was chosen by Samson.  Theologically, this is God's permissive will.  This is not God's directive will.  And the purpose God allowed Samson to marry the Philistine woman was to make Samson to confront the Philistines (v.4).  In other words, God allowed Samson to marry her so that he would begin the deliverance of Israel from the hands of the (13:5).

What is God's will regarding marriage?  Is it God's will for a Christian to marry an unbeliever?  My personal thought is that we should think separately about being married to the unbeliever and become one flesh and marrying the unbeliever and witness to him or her.  Surely salvation of the unbeliever is the will of God, but I think it is not the will of God to marry the unbeliever who does not believe in Jesus.  Of course, when we choose to marry an unbeliever, God, who respects our free will, allows the marriage so we can say it is God's permissive will.  It is also the will of God so I do not know whether we can say that it is God's will to marry unbelievers.  However, when we consider the first marriage of Adam and Eve, which began in Genesis, and the marriage of the Groom Jesus and the bride, the Church, in Revelation, I don’t think the believer and the unbeliever can marry and become one flesh.  Since the marriage between a man and a woman refers to the marriage between Jesus and the church, how can an unbeliever in a bridal church participate in the wedding of the Lamb?  The blessed people who are invited to the wedding supper of the Lamb (Rev. 19:9) are God's chosen people whom God loved and chose before the foundation of the world (Eph. 1:4).  Only the disciples of Jesus Christ can participate in the marriage feast of the Lamb because all of their sins are forgiven by the blood of Jesus Christ on the cross and are justified by the resurrection of Jesus Christ (Rom. 4:25).  Obviously, the Bible says that the bridal church that can participate in the marriage feast of the Lamb is holy and without blemish before God, a radiant church, without stain or wrinkle or any other blemish (Eph. 5:27).  Then how can a believer marry an unbeliever and become one flesh?  How can righteousness and wickedness have in common and what fellowship can light have with darkness? (2 Cor. 6:14)  “What harmony is there between Christ and Belial? What does a believer have in common with an unbeliever?” (v. 15)  Is it really true that we Christian who believe in Jesus marrying an unbeliever God’s will?