There are a lot of sins that don't specifically get mentioned. More often than not sins only get a mention when they needed to be highlighted, which implies that pedophilia is not going to turn up because of the general way that the Jewish people treated their children.
Racism in terms of skin colouring doesn't seem to have been much of an issue then or later. There is plenty of ethnic racism, though but wars were fought between ethnic groups so ill feelings would be expect.
For the Christian both of those would fall outside of the category of "Love your neighbour as yourself", so be naturally sinful.
Yes. Racism (a modern ill born from the "scientific era") is merely a category of social bigotry, and "Neither Jew nor Gentile" adequately covers the racism issue, as it is the primary social bigotry that Paul's congregations experienced. Between "Neither Greek nor Jew" "neither free nor slave" and "neither male nor female," he pretty much covered all the bases of his time.
Moreover, that particular pattern of repetition was the rhetorical method of saying, "Everything in every way." The writer of Hebrews does that a couple of times. It's the same rhetoric as Jesus saying "Seventy times seven."
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