Its their go to answer on anything they cannt defend
Not really. It is easily defended. God does His will for His own glory.
When Israel was chosen from among the nations....God gave some explanation;
6 For thou art an holy people unto the Lord thy God: the Lord thy God hath chosen thee to be a special people unto himself, above all people that are upon the face of the earth.
7 The Lord did not set his love upon you, nor choose you,
because ye were more in number than any people; for ye were the fewest of all people:
8
But because the Lord loved you, and because he would keep the oath which he had sworn unto your fathers, hath the Lord brought you out with a mighty hand, and redeemed you out of the house of bondmen, from the hand of Pharaoh king of Egypt.
9 Know therefore that the Lord thy God, he is God, the faithful God, which keepeth covenant and mercy with them that love him and keep his commandments to a thousand generations;
10 And repayeth them that hate him to their face, to destroy them: he will not be slack to him that hateth him, he will repay him to his face.
11 Thou shalt therefore keep the commandments, and the statutes, and the judgments, which I command thee this day, to do them.
It is not spoken of as a mystery.
jer313 The Lord hath appeared of old unto me, saying, Yea, I have loved thee with an everlasting love: therefore with lovingkindness have I drawn thee.
Jew and gentile on equal footing was previously a mystery,
Eph3
Ephesians 3 King James Version (KJV)
3 For this cause I Paul, the prisoner of Jesus Christ for you Gentiles,
2 If ye have heard of the dispensation of the grace of God which is given me to you-ward:
3
How that by revelation he made known unto me the mystery; (as I wrote afore in few words,
4 Whereby, when ye read, ye may understand my knowledge in the mystery of Christ)
5 Which in other ages was not made known unto the sons of men,
as it is now revealed unto his holy apostles and prophets by the Spirit;
6 That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:
and of course this:
16 And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.
