Jesus DID die for all of mankinds sins - however, you must accept Jesus as who He says He is, He is GOD, God's Only Son, Messiah and Salvation.
Just because He died for all mankind does not mean that everyone is saved - refer to the above.
When Jesus returns to set up His earthly kindom (after the Tribulation and the 7 year reign of the Anti Christ) He will rule for 1,000 years - having bound satan from decieving the masses - and will rule a witness during this time. The catch is that right now is the time to choose sides, not in millenium, this thousand year reign is to judge the nations based on their acceptance or denial of THE TRUTH.
So, sin still exists, man is still impure unless they live in a constant state of repentance and trying to live a Godly life - like that of Jesus.
We must still wear cloths and avoid the sins of the flesh in order to acheive perfection - it is because of the devil and his ability tempt mankind to deny The Holy One of God and therefore fall into sin.
The greatest trick the devil pulled is convincing the world that he doesn't exist.
He does - for now - until after the 1,000 year reign of Jesus. After the thousand year reign of Jesus, He (Jesus) will throw satan, the antichrist and the false prophet and whoever fell for their lies (ie. mark of the beast and the destrucion of Christianity and murder/persecution of God's Holy elect and believer.)
All of this is written in the book of Revelations.
In regards to the purity issue - it is all throughout scripture - the above is just a condensed "in a nut shell" response.
I also must mention the fact that just because Jesus has destroyed all sin (by His death on the Cross) it can never be the way that God originally intended it to be like it was in the garden. People don't realize how much a persons sin effects the world around them. This is why God will make "All things New"
He needs to renevate - and when you renevate a home - it is never the same home as it was when it was first built, you make improvements...
Does this Help?
Let me know,
<>< B
[edit on 11-6-2004 by Birkhoff]



