And this answers exactly to God's covenant with Israel made at Sinai. Jesus fulfilled this covenant for them, so in Christ they can receive the blessings.Your question is meant as a "gotcha" question and as a result you have obfuscated the subject of the conversation. Stick to the issue at hand.
I need to put up the verse because you have taken us so far off the track that you forgot the issue. We are discussing 1Peter 2:9.
But you are a chosen race, a royal priesthood, a holy nation, a people for God’s own possession, so that you may proclaim the excellencies of Him who has called you out of darkness into His marvelous light . . .
You have misconstrued Peter's meaning here. He is NOT talking about the church. He is talking about his kinsmen, whom the Lord himself described as the chosen race etc.
His readers are Hebrew and among the Hebrews, some of them have decided to believe in Jesus Christ. As Peter says, they have been called out of the darkness into the light. This is true for all true believers but it doesn't follow, therefore that all true believers are a chosen race, a royal priesthood, etc. That would be an erroneous conclusion.
Much love!