1. Purgatory doesn't mean that Christ's death was insufficient, it means that it won our redemption and the chance for us to be purified.

2. Purgatory isn't a second chance for us to get into heaven. It's not where the nonbelievers "suffer their way into heaven". It says in the Bible that...

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"He who does not believe is condemned already, because he has not believed in the name of the only Son of God."

-John 3:18

Reasons Why it Does Exist