Ouch.

"But you, O LORD, are a shield about me, my glory, and the lifter of my head." —Psalm 3:3

Shield: a mechanism that protects one from harmful force by absorbing or deflecting that force.

Christians can say that God is their shield because:
• All of humanity has not done what God created us to do {love him & other people}, which has messed things up pretty badly for the whole earth. Thus, all mankind are objects of his wrath. If we received the wrath we are due from him, it would destroy us.
• But he decided he wanted to keep some of us. He sent Jesus, {his son/him/it's complicated} who willingly, after living up to God's standards and intentions for humanity perfectly, took and absorbed all of God's wrath towards the people that would accept him as their substitute/shield. All of it—there's none left for us. God will never punish {in any way} those shielded by Jesus, because Jesus took all that was due to us—for us. If punishment has been paid once in full for a particular group of people, it would be unjust of God to demand payment from those people for the same thing a second time.