1. Corporate salvation is not my opinion. It's regarding Romans chapters 9, 10 and 11.
I'll try to find some links...it's complicated.
www.messianicgoodnews.org
en.wikipedia.org
2. A nation of priests: (I thought YOU posted the scripture)
1 Peter 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;
3. We are not saved by our works, as Ephesians 2:8 states.
However, after we come to believe in Jesus and are saved,,,,we are expected to obey God and this does require some of our own works.
James 2:26
For as the body apart from the spirit is dead, so also faith apart from works is dead.
Matthew 7:21
“Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven.
Titus 2:7
Show yourself in all respects to be a model of good works, and in your teaching show integrity, dignity, and sound speech that cannot be condemned, so that an opponent may be put to shame, having nothing evil to say about us.
and much more...