Why is it necessary for Christ to be both God and man?

Christ's dual nature as fully God and fully man is essential for our salvation. As God, He possesses the authority and capacity to bear the full weight of God's wrath against sin, fulfilling the divine requirement of justice. As man, He identifies with us in our human experience, allowing Him to be our perfect representative. Hebrews 4:15 emphasizes this as it states that Christ was tempted in all points as we are yet without sin. This unique union ensures that He can accurately bridge the gap, embodying the role of Mediator who understands our plight while having the power to redeem us. Thus, salvation is rooted in both His divinity and humanity working in concert.