Basically, mid-Acts dispensationalists believe in at least 7 dispensations for salvation--only the "Age of Grace" is by grace through faith alone in Christ alone:While Paul wrote to the differnet churches His teachings apply to both saved and unsaved. He tells the unsaved about their condition and the believer about living for Christ and gives us knowledge of what God has accomplished for us.
Does that answer your question?
1. Dispensation of Innocence (Adam and Eve in Eden)
2. Dispensation of Conscience (The Fall through the Flood)
3. Dispensation of Human Government (Post-Flood Noah through Abram)
4. Dispensation of Promise (Abraham through pre-Law Exodus)
5. Dispensation of Law (Law given to Moses until conversion of Paul)
6. Dispensation of Grace (Conversion of Paul until Rapture)
7. Dispensation of the Kingdom (Tribulation and Millennial Kingdom)
The idea is that in all but the sixth dispensation, works were part and parcel to one's salvation. In other words, when Jesus was on earth, He taught a Jewish "kingdom gospel" of salvation that included works (The Law) as a requirement for justification. Also, the Great Commission was actually part of the Jewish "kingdom gospel" and has nothing to do with "The Body of Christ."
This also means that from Pentecost until Paul's conversion, salvation supposedly still required works (water baptism and the Law). Jesus, Peter, James, and other Apostles taught faith + works salvation. Only with the conversion of Paul did "The Age of Grace" begin where salvation is by grace through faith alone in Christ alone. Therefore, the early church had to deal with the wrinkles of having, for a time, two legitimate gospels ("the gospel of the circumcision" and "the gospel of the uncircumcision") being preached to two different groups--the "Church of Israel" and "the Church, which is His Body."
The Church of Israel is those Jews (and Gentile proselytes) who were saved under the "kingdom gospel" who will rule and reign with Christ during the Millennial Kingdom.
The Body of Christ is those saved under the "Age of Grace" (the "mystery" revealed specially to Paul) wherein Jew and Gentile are equal. These will be raptured before the seven-year tribulation and will remain in heaven forever (they will not reign with Christ on earth).
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I am NOT a mid-Acts dispensationalist, but I have family members who are. Mid-Acts'ers call their theology and their church "Pauline." Because you kept emphasizing that you primarily followed Paul's epistles, I assumed you were mid-Acts dispensationalist.