Protestantism: If justification is by faith alone how can judgement be by works?

The idea of justification seems to come often in Paul, Romans 3:20: > Therefore by the deeds of the law there shall no flesh be justified in > his sight: for by the law is the knowledge of sin Jesus affirms something even more bluntly, John 5:24: > “Very truly I tell you, whoever hears my word and believes him who > sent me has eternal life and will not be judged but has crossed over > from death to life. However, why does justification even matter, and how is it that the justified are not even coming into judgement, since, everything seems to end up in judgement anyways: Romans 2:6 > God “will repay each person according to what they have done.” Jesus (Matthew 7:21): > Not everyone who says to me 'Lord, Lord,' will enter the kingdom of > heaven, but only the one who does the will of my Father in heaven.