How do you apply this scripture to the problem, seeing as how this scripture specifically relates to problems the Corinthian church was having with people attempting to add/bring in idol worship to the worship of God.
First of all, 2 Corinthians was not addressed exclusive to the church in Corinth.
2 Cor. 1:1 Paul, an apostle of Christ Jesus by the will of God, and Timothy
our brother, To the church of God which is at Corinth with all the saints who are throughout Achaia:
2. Grace to you and peace from God our Father and the Lord Jesus Christ.
Secondly, Paul’s teachings are based upon the scriptural principle of separation, a principle found throughout both the Old Testament and the New Testament. Paul, in writing about himself when writing to the church at Rome, wrote,
Rom. 1:1. Paul, a bond-servant of Christ Jesus, called
as an apostle,
set apart for the gospel of God,
Light and darkness are contrasted in very many places in the Scriptures, including: Matt. 4:16, 6:23, 10:27; Luke 1:79, 11:34-5, 12:3; John 1:5, 3:19, 8:12, 12:35, 12:46; Acts 26:18; Rom. 2:19, 13:12; 1 Cor. 4:5; 2 Cor. 4:6, 2 Cor. 6:14; Eph. 5:8; 1 Thess. 5:5; 1 Pet. 2:9. 1 John 1:5, 2:8-9.
Thirdly, marriage is the sacred bonding together of two in such a manner that they become one:
Matt. 19:4. And He answered and said, "Have you not read that He who created
them from the beginning MADE THEM MALE AND FEMALE,
5. and said, 'FOR THIS REASON A MAN SHALL LEAVE HIS FATHER AND MOTHER AND BE JOINED TO HIS WIFE, AND THE TWO SHALL BECOME ONE FLESH'?
6. "So they are no longer two, but one flesh. What therefore God has joined together, let no man separate."
1 Cor. 6:15. Do you not know that your bodies are members of Christ? Shall I then take away the members of Christ and make them members of a prostitute? May it never be!
16. Or do you not know that the one who joins himself to a prostitute is one body
with her? For He says, "THE TWO SHALL BECOME ONE FLESH."
17. But the one who joins himself to the Lord is one spirit
with Him.
18. Flee immorality. Every
other sin that a man commits is outside the body, but the immoral man sins against his own body.
19. Or do you not know that your body is a temple of the Holy Spirit who is in you, whom you have from God, and that you are not your own?
20. For you have been bought with a price: therefore glorify God in your body.
2 Cor. 6:14. Do not be bound together with unbelievers; for what partnership have righteousness and lawlessness, or what fellowship has light with darkness?
15. Or what harmony has Christ with Belial, or what has a believer in common with an unbeliever?
16. Or what agreement has the temple of God with idols? For we are the temple of the living God; just as God said, "I WILL DWELL IN THEM AND WALK AMONG THEM; AND I WILL BE THEIR GOD, AND THEY SHALL BE MY PEOPLE.
17. "Therefore, COME OUT FROM THEIR MIDST AND BE SEPARATE," says the Lord. "AND DO NOT TOUCH WHAT IS UNCLEAN; And I will welcome you.
18. "And I will be a father to you, And you shall be sons and daughters to Me," Says the Lord Almighty.
1. Therefore, having these promises, beloved, let us cleanse ourselves from all defilement of flesh and spirit, perfecting holiness in the fear of God.
Eph. 5:22. Wives,
be subject to your own husbands, as to the Lord.
23. For the husband is the head of the wife, as Christ also is the head of the church, He Himself
being the Savior of the body.
24. But as the church is subject to Christ, so also the wives
ought to be to their husbands in everything.
25. Husbands, love your wives, just as Christ also loved the church and gave Himself up for her,
26. so that He might sanctify her, having cleansed her by the washing of water with the word,
27. that He might present to Himself the church in all her glory, having no spot or wrinkle or any such thing; but that she would be holy and blameless.
28. So husbands ought also to love their own wives as their own bodies. He who loves his own wife loves himself;
29. for no one ever hated his own flesh, but nourishes and cherishes it, just as Christ also
does the church,
30. because we are members of His body.
31. FOR THIS REASON A MAN SHALL LEAVE HIS FATHER AND MOTHER AND SHALL BE JOINED TO HIS WIFE, AND THE TWO SHALL BECOME ONE FLESH.
32. This mystery is great; but I am speaking with reference to Christ and the church.
33. Nevertheless, each individual among you also is to love his own wife even as himself, and the wife must
see to it that she respects her husband.
What fellowship has light with darkness or what has a believer in common with an unbeliever?