This is how it was explained to me by non-denom, protestant evangelicals (whew, what a mouthful!).
- All have sinned and fallen short of the glory of God. (Romans 3:23)
- The wages of sin is death. (Romans 6:23)
- For God so loved the world that He gave his only Son… that whoever believes in him will not die but have eternal life. (John 3:16)
To them, it’s this simple. Sin activates the divine punishment machine. Sin has occurred, punishment MUST be meted out. Only a spotless, pure unblemished sacrifice can stand in for the sinner in said divine punishment machine. Christ volunteered to be that sacrifice, traded his perfection for our sin and accepted the punishment and torment due to all sinners throughout history. We believers make out like bandits on the deal because we trade in those sins for the ‘imputed’ righteousness of Christ. God looks at believers and does not see who they really are, but sees only the perfection of Christ (due to the switcheroo mentioned above).
Personally, I find the above a horrifyingly juvenile simplification. Distortion really. It reduces God to a mechanistic automaton who is compelled to mete out punishment and pulls a lawyer trick to beat on himself instead of we who are guilty.
The catholic version I learned is beautiful instead of grotesque. God’s justice isn’t about the need he has to mete out punishment for sin, it is about his LOVE. Sin creates its own punishment and WE humans would be the ones who make up everything that is unpleasant about hell. Christ died because he became incarnate among sinful men. He didn’t have to die to satisfy the Father’s wrath, he had to die because it was the outcome of OUR sinfulness. Fallen man inevitably kills God given the chance. The “Jews” didn’t do it, MAN did. We did. By being willing to suffer that unwarranted murder, Christ reveals in full glory how great is the love of God for us. That he loves is STILL is the greatest source of hope humanity can ever know. We look forward to eternal bliss in heaven not because we’ve deluded God (with his help) into seeing us as perfect, but because we believe that by his Grace we really WILL be perfect by then. That transformation is something that we can’t achieve on our own power and needs a lifetime (and beyond) of cooperation with Grace to complete. That calls for an AMEN! Amen to eternal bliss with the inventor of love!
The catholic explanation fits the fullness of Scripture too. Look it up!