The Paris Architect

In the beginning, Lucien considers himself a selfish person and is motivated to help protect Jewish people through disgust for his own cowardice. Would he have helped if he was not a coward in the first place?

Celeste calls Lucien “an architectural Mephistopheles,” saying he is a collaborationist willing to sell his soul for the chance to design. Is she right? Why or why not?

Lucien expresses anti-Semitic views throughout the book but eventually takes Pierre in and comes to consider him a son. Did Lucien stopped being anti-Semitic or is he simply making an exception for the only Jewish child with which he has spent a lot of time?