I see homosexuality in 1 Cor. 6.9 because that's what it says. Paul is talking about the wicked who will not inherit the kingdom of God.
- The sexually immoral: πόρνοι. A generic term for every kind of unlawful sexual intercourse. Whoring one's body. But then Paul details what some of those are.
- idolaters: εἰδωλολάτραι. Depending on something other than God. Putting one's trust in anything other than God's grace.
- adultery: μοιχοὶ. Sexual relations between a married person and someone who is not his or her spouse.
- male prostitutes: μαλακοὶ. The passive, receiving partner in homosexual intercourse. A man or boy who is used for anal sex.
- homosexual offenders: ἀρσενοκοῖται. Greek: "man coitus." The active penetrator in homosexual intercourse. The sodomite or pederast.
- thieves: κλέπται. Thieves; robbers.
- greedy: πλεονέκται. Greed; self-indulgence at the expense of others; avaricious over-reachers.
- drunkards: μέθυσοι. Overindulgence in alcohol to the point of loss of control.
- slanderer: λοίδοροι. Abusive verbal accusers and insulters of others; those who lie about other people.
- swindler: ἅρπαγες. Robbers. A stronger term than "thieves." Cheaters; deceivers.
People don't insert homosexuality into the list, Paul did. ἀρσενοκοῖται means what it means. The first half of the word (arsenikos) denotes "male", and the second half of the world denotes "coitus" — relates to male coitus with a male. In ancient Greece and Rome, same sex coitus was often pederastic (though not always), often a display of power (a right and privilege of the wealthy and powerful, or the head of the household), but sometimes just sexual engagement. Therefore the word does include pederasty and homosexual rape, but that's not its only meaning.
You can't remove it from the list because you think it's not a normal thing to be tempted about. Paul put it on the list because it's something wicked that prohibits one from entering the kingdom of God. This is wicked (ἄδικοι) behavior that prohibits inheritance of the kingdom.
You say we can only go by the text, not man's words. Great, then let's go by the text. "Neither the sexually immoral nor idolaters nor adulterers nor male prostitutes nor homosexual offender ... will inherit the kingdom of God." Anyone who is not sanctified from these sins (1 Cor. 6.11) is not justified before God.
> 1 cor 6:9 is about Paul telling them not to take disputes with brethren to mans court but to settle disputes in the church.
You missed the flow and Paul's point.
vv. 1-3: Don't take your disputes with brothers to man's court, but settle such disputes in the church, as you said.
v. 4: We cannot dream we'll hear God's wisdom from people who are unredeemed sinners.
v. 5: Certainly there is someone in the church who can judge with God's wisdom!
v. 6: It's wrong to show the dirty laundry of your church conflicts in front of godless magistrates and to let them, who don't have access to the Holy Spirit, settle your disputes.
v. 7: These disputes all by themselves show that you are not living in the unity of the Spirit, and about that you should be ashamed. Instead, turn your other cheek and absorb the wrong. It's a better choice than making the Church and Christ look bad.
v. 8: Instead, you are acting like sinners yourselves! That's bad enough, but your victims are your Christian brothers and sisters. It's shameful behavior.
vv. 9-10: Anyone who continues in his or her sin doesn't inherit the kingdom of God. And if you are someone who continues in sin, then beware the judgment of God. You should be ashamed of yourself. Do not be deceived: Religious demeanor doesn't justify wicked behavior.
But then in v. 11 is the clincher: "And that is what some of you were." In other words, some of them were ἀρσενοκοῖται, but now they are washed (a probable reference to baptism)—a change of life-orientation, sanctified (set apart for God), and justified (set free from that wickedness). Clearly, and irrefutably, some of them were involved in sodomy, but now they have been changed, redeemed, set apart for Christ, and set free from that lifestyle and behavior.