The Bible teaches that all humanity is represented by one of two people – Adam or Christ. Those who are represented by Adam are said to be “in Adam” while those represented by Christ are said to be “in Christ”.
Adam was man’s first representative and he failed to live up to God’s standards and rebelled against Him. This rebellion brought with it the curse of sin. (Genesis 3)
Christ was man’s second representative who lived up to God’s perfect standards. This obedience brings with it the gift of salvation. (Romans 8)
This is taught in Romans 5:18…
“Through one man’s offense judgment came to all men, resulting in condemnation, even so through one Man’s righteous act the free gift came to all men, resulting in justification of life.
And again in 1 Corinthians 15:21-22…
“Since by man came death, by Man also came the resurrection of the dead. For as in Adam all die, even so in Christ all shall be made alive.
Those who choose to be represented by Adam are represented by sin and rebellion and are under God’s wrath. But those who choose to be represented by Christ are represented by perfect righteousness and stand blameless before God.