From Catholic Archbishop of Mobile, Rev. Thomas Rodi (excerpt, full-text at link, emphasis all mine):
This is our right as Americans and as citizens of Alabama. Sometimes people will say that the U.S. Constitution gives us the freedom to worship. Actually, the Constitution gives us the right to the free exercise of our religion. “Freedom to Worship” means that we can come together on Sunday to worship. “Free Exercise” means that, when we leave church on Sunday, we have the right to exercise our faith in our daily lives. This new law prevents us as believers from exercising our life of faith as commanded by the Lord Jesus.
I did not wish to enter into a legal action against the government of Alabama. It is not my temperament to look for an argument. I prayed fervently about this matter, and my prayer kept bringing me back to the motto I chose ten years ago for my bishop’s coat of arms: “The love of Christ impels us” (2 Cor 5:14) Indeed, the love of Christ impels us to “Go, therefore, and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit…” (Matthew 28:19). No law is just which prevents the proclamation of the Gospel, the baptizing of believers, or love shown to neighbor in need. I do not wish to stand before God and, when God asks me if I fed him when he was hungry or gave him to drink when he was thirsty, to reply: yes, Lord, as long as you had the proper documents.
Throughout our history we have been a nation of immigrants. The words of Moses to the Hebrew people should resonate in our own hearts: “You shall not oppress or afflict the alien among you, for you were once aliens residing in the land of Egypt.” (Exodus 22:20) As citizens we have the right to live our Christian faith. As Christians, we have an obligation to do so.