Through faith in Christ, by virtue of His atoning sacrifice - in God's eyes - I am justified, made perfect, holy, period.
Do you think Christ gave special dispensation to the repentant thief when he said "today, you will be with me in paradise"?
Yeah, but the thief didn't commit any further sins...
The bible DOES say that "to be absent from the body is to be present with the Lord" which militates in some measure against the idea of a progressive entrance into heaven.
I have to say that I found your statement about "snow covered dunghills" to be stupid, offensive, and, by the way, never a statement made by Martin Luther. The only place you find it is on the internet, in Catholic/Protestant debates. Luther never said it. However, even if he had, Luther was a German peasant whose language was...., "colorful" when he got wound up and going, but I would not attempt to vivisect my theological understanding of protestantism with some of his loopier statements.