Why did Jesus come into the world? To save people from their sins through his death and resurrection! At the virgin birth, deliverance is coming for God's people, and God's judgment is coming to those who reject him. We're born of sin; salvation must come from outside ourselves. That's why Jesus came!
When we stand before God on judgment day, all we need is him. If we choose God's kingdom over the kingdom of darkness, we are born again and will live in that kingdom forever.
If you think you're too far gone to enter God's kingdom, you are not. Believe in him and have everlasting life! We gather on Christmas to thank God for coming and dying for sinners like us.