Today too many so-called Christians are getting stumbled on Matthew 19:9, unaware that God doesn't allow remarriage in case of divorce. Mark 10:11-12, Luke 16:18, Hebrews 13:4, James 4:1-10, 1 Corinthians 6:9-10 warn us a lot dealing with lives in adulterous unions.
What makes an illegitimate marriage? One who had pre-marital relations became one flesh with that person and if anyone didn't marry that person does God still recognize the act in and of itself as a marriage? ! Corinthians 6:
15 Know ye not that your bodies are the members of Christ? shall I then take the members of Christ, and make them the members of an harlot? God forbid.
16 What?
know ye not that he which is joined to an harlot is one body? for two, saith he, shall be one flesh.
17 But he that is joined unto the Lord is one spirit.
18 Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.
19 What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own?
20 For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's.
Notice verse 16, that would mean any type of marital relations make you one flesh with that person. So by what this teaching says no one who has ever had pre-marital relations is to be allowed fellowship in a church. Is that what you believe? No then is this before or after salvation? When did the relations happen, or do you believe noone who has ever committed adultery can go to heaven.
1 Corinthian 6 settles this,
4 If then ye have judgments of things pertaining to this life, set them to judge who are least esteemed in the church.
5 I speak to your shame. Is it so, that there is not a wise man among you? no, not one that shall be able to judge between his brethren?
6 But brother goeth to law with brother, and that before the unbelievers.
7 Now therefore there is utterly a fault among you, because ye go to law one with another. Why do ye not rather take wrong? why do ye not rather suffer yourselves to be defrauded?
8 Nay, ye do wrong, and defraud, and that your brethren.
9 Know ye not that
the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,
10 Nor thieves, nor covetous, nor drunkards,
nor revilers, nor extortioners, shall inherit the kingdom of God.
11 And
such were some of you: but ye are washed, but ye are sanctified, but ye are justified in the name of the Lord Jesus, and by the Spirit of our God.
Those who are truly saved and have committed the things listed ar Sanctified and Justified in the Name of The Lord Jesus and By the Spirit of our God. Notice something in the list which could possibly apply to you from this post "revilers". To revile is defined as " to assail with contemptuous or reproachful language; address or speak of abusively. Be careful how you speak of others as you need to ensure a clean heart as all do before making an accusation. You notice I carefully stated that you may be guilty of these not that you were. It seems to be that way but it might not be. However you do seem to miss the fact that some were at one time guilty but Paul said they were washed and sanctified and justified in the name of Jesus and by the Spirit. Forgiven even of adultery.