Schreiner makes faith the difference maker

 One of the hardest things about reading Schreiner is that he is unclear. He says things in which seem and sound good; such as, "Yes, the verdict is effective: we really are in a right relationship with God since Christ is our righteousness and we are united to Christ by faith. We are truly right in God's sight by faith alone!"

I would not say that we are united to Christ by faith. But I would say that because we were united to Christ through his death, burial, and resurrection therefore we look upon him by faith. So when we say we are justified by faith we are really saying we are justified by Christ alone.

But then again, Schreiner says we are made right by faith alone, but then he'll say we need works to enter heaven. In some way works, according to him, is necessary for salvation. So Schreiner is always in a perpetual doubt.