Blameless = sinless; unless one wishes to adopt the position that there are sins that carry with them no blame.
Original sin would qualify, I suppose, but I can't think of any other.
Also of interest, Job gives us an example of one man's prayers and sacrifices atoning for another's sins (he offers for the sins of his children).
***Blameless = sinless; unless one wishes to adopt the position that there are sins that carry with them no blame.***
Blameless may also mean a person who seeks forgivness for their sins as soon as they stumble.
Paul says that because of Christ's death on our behalf and by the power of God WE can alos be presented blameless to God on judgement day...
"And you, who once were alienated and hostile in mind, doing evil deeds, he has now reconciled in his body of flesh by his death, in order to present you holy and blameless and above reproach before him,"
- Col 1
If anything is clear from the above verse it is that blamelessness does not mean "sinless". The people described, while guilty of evil deeds, can still be considered "holy and blameless" through the death of Christ on their behalf.