"[Politeia] in the first-century Greco-Roman context could mean a community of nations or ethnic groups sharing a common allegiance to a monarch."
"...Paul is not necessarily arguing that Gentile converts are citizens of Israel; rather, taken together, these Gentile converts and Jewish people constitute the 'commonwealth of Israel,' which David Rudolph describes as 'a multinational expansion of Israel proper that has emerged in the form of the Church.' It must be further noted that these Gentile converts are called 'heirs together with Israel' in Ephesians 3:6 [italics added]....had Paul desired to make his readers believe they were a part of Israel, or Israelites, he would have surely made it clear. However, the one time he comes close to teaching this in Ephesians 2-3, he uses distancing language--'commonwealth of Israel' rather than 'Israel'; 'together with Israel' rather than 'as a part of Israel,' [italics added]" (Twelve Gates by Boaz Michael).
- "The commander answered, 'I acquired this citizenship [politeia] with a large sum of money.' And Paul said, 'But I was actually born a citizen,'" (Acts 22:28).
- "For our citizenship [politeuma; 'commonwealth,' RSV] is in heaven, from which also we eagerly wait for a Savior, the Lord Yeshua the Messiah" (Philippians 3:20).
"Anyone who would try to equate the Greek term politeia with a kind of multiple nation-state commonwealth in mind, does not have strong support either from classical usage or Biblical usage of the term."
[Here's the link to Rudolph's article: CLICK HERE FOR LINK]