1 If any of you has a dispute with another, dare he take it before the ungodly for judgment instead of before the saints?
2 Do you not know that the saints will judge the world? And if you are to judge the world, are you not competent to judge trivial cases?
3 Do you not know that we will judge angels? How much more the things of this life!
4 Therefore, if you have disputes about such matters, appoint as judges even men of little account in the church! [14]
5 I say this to shame you. Is it possible that there is nobody among you wise enough to judge a dispute between believers?
6 But instead, one brother goes to law against another--and this in front of unbelievers!
7 The very fact that you have lawsuits among you means you have been completely defeated already. Why not rather be wronged? Why not rather be cheated?
8 Instead, you yourselves cheat and do wrong, and you do this to your brothers.
9 Do you not know that the wicked will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor male prostitutes nor homosexual offenders
10 nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God.
11 And that is what some of you were. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.

19 Do you not know that your body is a temple of the Holy Spirit, who is in you, whom you have received from God? You are not your own;
20 you were bought at a price.

What does it say?

v.6:9 is talking "about" a group of people.  But look at v.6:11, it's talking "to" another group of  people.

1 Cor 6:11
And that is what some of you were. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.

There are two groups of people, one group going to heaven; another not going to heaven.

The author is writing to the group that's going to heaven, and maybe stressing that the group going to heaven shouldn't look down on the group that's not on the right path, since some of them (us) came from that group.

The group going to heaven was washed, sanctified, justified, i.e. forgiven and cleaned up.  There's nothing there that says anything about, as long as..., or if ..., or unless...  It's not a conditional statement.

Look at v.20.  It says you were "bought" with a price.  It doesn't say anyone is going to sell you or throw you away if you don't perform properly.

I could see it saying, because you're part of the group that's been cleaned up and saved, you shouldn't do all those bad things like the unsaved group.

Paul, the author, is upset with these people. He wants  them to change and stop sinning.  He's saying in verses 8 and 9, to wake up, all these wicked things are what the unbelievers do, these are not the things that believers do.  But he's not making any threats that include loss of salvation.