Question:
What does it mean that He (Christ) is our Lawyer?

Answer:
He is our advocate (1 John 2:1). Like a lawyer represents people in court, He represents His people in heaven. Jesus Christ the righteous. He has the power to represent us because of the sufficiency of His sacrifice. When Satan (the accuser of the brethren) shows our sin to God, Jesus is there saying He died for that sin.