Christians believe that Jesus died for their sins.

The popular Christian belief is that all men are sinners.
The wages of sin is death.
So all men are condemned to die for their sins.
But Christians believed that by dying in place of all men,
Jesus redeemed all men from the condemnation of sin.
Jesus ransomed all men from death, who accept the gift of grace from God.

IMO, according to the Scriptures in the OT, it is impossible for a man to die for another man’s sins. It is impossible for a man to redeem or ransom another man from God’s condemnation of death.

Allow me to show you from the Scriptures.

Psalm 49:6-9
6They that trust in their wealth, and boast themselves in the multitude of their riches;
7None of them can by any means redeem his brother, nor give to God a ransom for him:
8(For the redemption of their soul is precious, and it ceaseth for ever
9That he should still live for ever, and not see corruption.

No man can redeem the soul of another. Not with riches nor with anything else.

Deuteronomy 24:16
The fathers shall not be put to death for the children, neither shall the children be put to death for the fathers: every man shall be put to death for his own sin.

Everyman shall be put to death for his own sin. Jesus cannot be put to death for your sin.
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Leviticus 27:29
No one doomed to death under the claim of divine justice, who is to be completely destroyed from among men, shall be ransomed from suffering the death penalty; he shall surely be put to death.

No man condemned to death by God for his sins, can be ransomed or redeemed. He must be put to death.

Scripture cannot be broken. According to the OT, Jesus could not die for your sins.

When Jesus was executed by the Romans unexpectedly, his Apostles needed to find an excuse for Jesus’ death. They said Jesus died for the sins of mankind. With this lie they could continue evangelizing and passing the basket to collect “offerings” at meetings of the ignorant and superstitious. Evangelism was a better way to earn a living rather than fishing or doing other manual labor.

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Maybe an Easter card, with some lovely children's art on it. I'm sure Betsy DeVos would approve of the gruesome scene once it's explained as people being cleansed with Jesus' sacrificial blood, so it's uplifting and not actually morbid. No reason to bring in the child psychologists.