Jesus Christ is the Elect of God. He is described in Scripture as a chief cornerstone, elect, precious, and he who believes on Him will by no means be put to shame (Isaiah 28:16; 1 Peter 2:6). You are elect in Christ alone. That's because your election is confirmed by faith in Christ alone (John 14:6; Acts 4:12).
God's people are elect in Christ. The initiative for your salvation is with the eternal God. In eternity, God's purpose was to justify believers in and through Christ, before the world began (Ephesians 1:4-5; 2 Timothy 1:9). God chose you through faith in Christ alone.
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 (1 Corinthians 15:1-4).
God's elect are called out of spiritual darkness, into the light of Christ (1 Peter 2:9). You are God's new creation in Christ (Ephesians 2:10; 2 Corinthians 5:17). That's your election in Christ.
By grace alone through faith in Christ, God saves you from condemnation (Ephesians 2:8-9). It's God's eternal purpose in Christ. God's purpose is to save you to the praise of His glorious grace in Christ (Ephesians 1:6, 12, 14). That's your election in Christ.