When we put on the armor of God (Ephesians 6.10-17), in reality we are putting on Christ. Nothing we do can be done without His life flowing in us (John 15.5). We are IN Him (*). Consider how each elements of the armor is attributed to Jesus:
Truth—John 14.6
Righteousness—1 Corinthians 1.30,31
Gospel of peace—Galatians 1.6,7; Isaiah 9.6!
Faith—Hebrews 12.1,2
Salvation—Acts 4.10-12; Romans 10.9
Spirit, Word of God**—John 1.1
*Romans 6.11; 8.1; 12.5; 1 Corinthians 1.30…this is a fascinating study all on its own…look it up!
** see the connection of the Trinity especially in the connection of Jesus being glorified and now the Holy Spirit has come down to us John 7.37-39; Acts 2.31-36; Romans 8.9-11