Blessed are those who keep his testimonies,
who seek him with their whole heart,
who also do no wrong,
but walk in his ways!
There are Protestants who claim that no one lives a sinless life: that to do so is impossible for us. Setting aside the injustice of being held to a standard which is beyond attainment, there is another problem. Verse three says those who “do no wrong” are blessed. If Protestants are correct in claiming that literally everyone sins, then this passage is addressed to…no one. The empty set. Which of course, is absurd in itself (why say anything to or about a group with zero members?).
Another problem is that this passage clearly and unambiguously presumes a theology of sin which is inconsistent with the idea that literally everyone sins. Protestants who say otherwise are mistaken.