Paul shaved his head & took a vow in Acts 21 to show the Jews that they were all still under the law

Acts is about two churches coexisting side by side. Yes, the kingdom promise was diminishing, but the Jews who came in contact with Paul were still going into the Kingdom program. In fact up until Acts 28 the opportunity was there to be a kingdom saint. After Acts 28 the Kingdom saints still kept their promise until their death, but no one new was added. Only the Body of Christ was available after Acts 28