"Behold, I lay in Zion a chief cornerstone, elect, precious, and he who believes on Him will by no means be put to shame" (Isaiah 28:16). Christ is the elect of God, as the cornerstone of every believer's salvation. Therefore, the believer's election is in Christ.
Our election is in Christ. He should always be the focus to understand our election. Christ is the Elect of God, precious to the Father and all who believe in him. Our election is sure in Christ alone. The Bible tells us to "make your calling and election sure" (2 Peter 1:10).
In eternity God purposed to justify people, who by grace believe in and through our Lord Jesus Christ (Ephesians 1:4-5; 2 Timothy 1:9). Our election includes all true believers in Christ. Our election is sure in the elect one, even Christ Jesus our Lord.
To be in Christ means you are a believer, baptized by the Holy Spirit into the body of Christ (1 Corinthians 12:13). The body of Christ is the church. The word church does not refer to a denomination nor a sectarian group. It refers to all of God's people, saved through the gospel of our Lord Jesus Christ.
The love of God to save believers from condemnation has its eternal purpose and fulfillment in Christ. God's purpose to save is to the praise of His glorious grace in Christ (Ephesians 1:6, 12, 14). Make your election sure by God's grace, through faith in Christ. Our election is in Christ.