I would say the church consists of those who are regenerate by the Holy Spirit and by God's Word. As far as the promises that are unique to the church, I'm not sure.
We are discussing on this thread the translation of "the church." This is a unique doctrine of the church when the Lord comes for us in the air to take us to the Father's house where there are many mansions and where we will be glorified and will live forever in the presence of the Lord. So far few here have any understanding about the purpose of God in this age. The purpose of God in this age is stated in at least 3 chapters in the Pauline epistles but I will quote one from the history of Luke as he quotes James in Acts 15. You should look closely at this and see if the context enlightens your eyes.
Peter speaks;
Ac 15:6 And the apostles and elders (the elders would be members of the seventy (70) of Luke 10) came together for to consider of this matter.
7 And when there had been much disputing, Peter rose up, and said unto them, Men and brethren, ye know how that a good while ago God made choice among us, that the Gentiles by my mouth should hear the word of the gospel, and believe. (
this was in Acts 10)
8 And God, which knoweth the hearts, bare them witness, giving them (the gentiles) the Holy Ghost, even as he did unto us (Jews);
9 And put no difference between us and them, purifying their hearts by faith.
10 Now therefore why tempt ye God, to put a yoke upon the neck of the (gentile) disciples (the observance of the Mosaic Law as necessary for salvation), which neither our fathers nor we were able to bear?
11 But we believe that through the grace of the Lord Jesus Christ we (Jews) shall be saved (by simple faith instead of the works of the law of Moses), even as they (gentiles).
12 Then all the multitude kept silence, and gave audience to Barnabas and Paul, declaring what miracles and wonders God had wrought among the Gentiles by them.
James speaks:
13 And after they had held their peace, James answered, saying, Men and brethren, hearken unto me:
14
Simeon hath declared how God at the first did visit the Gentiles, to take out of them a people for his name.
15 And to this agree the words of the prophets; as it is written,
16
After this (after first taking out out of them, the gentiles, a people for his name)
I will return, and will build again the tabernacle of David, which is fallen down; and I will build again the ruins thereof, and I will set it up:
Can anybody follow the logic here?
17 That the residue of men (the rest of, the remainder of men) might seek after the Lord, and all the Gentiles, upon whom my name is called, saith the Lord, who doeth all these things.
It would be a blessing if someone on the Baptist Board could understand and believe the transitions of God, but alas, it does not seem like they can.
18 Known unto God are all his works from the beginning of the world.
19 Wherefore my sentence is, that we trouble not them, which from among the Gentiles are turned to God:
20 But that we write unto them, that they abstain from pollutions of idols, and [from] fornication, and [from] things strangled, and [from] blood.
21 For Moses of old time hath in every city them that preach him, being read in the synagogues every sabbath day.