The entity the Bible refers to as Israel is a nation of people, and yet they are so much more. They are God’s chosen people (Deut 7:6), God’s elect people (Jer 45:4), the people of God’s covenants (Eph 2:12), a peculiar people identified by the token of circumcision (Gen 17:11).
The key to understanding Paul’s statement within 1 Cor 10:32, and thus understanding the entirety of your Bible, is to properly identify when it is that the Church, the Body of Christ, began. Once one understands properly when it began, they next need to identify when and why it will end. Understanding these two critical points within history (within what the Bible has to say on the matter) will shape one’s doctrine and theology and will therefore have a huge impact upon that person.
Once grounded with when the Body of Christ started and when/why it must end, one can then explore the many unique characteristics about the Body of Christ that are detailed for us within Scripture. This is the study of Ecclesiology and it is an area where most self-professing Christians go wrong.
This may appear to be an aside, but it is not … I would ask where it is within the Bible that we can learn about the Body of Christ? Can you identify for me a single mention of the “Body of Christ” within Hebrews through Revelation? Does Jesus ever mention the term “Body of Christ” as Paul discusses it: