The teaching in Romans is about a specific group of people who "did not have God in mind."
No one ican say any one sin, law broken, is guaranteed to a reprobate mind, only one sin is a guaranteed unforgiveable sin, that of blaspheming the Holy Spirit, and even that, our Father in His mercy has shown itonly to be possible, so let usnot do such things.
Now thequestion here is why tdosome believers take it upon themslves to pick and choose unforgiveable sins? I know our Father does not.