Traditionally America was a Protestant nation that was skeptical of Roman Catholics ascending to power. The perception was that the Catholic's ultimate loyalty was to Rome, and not to America. There was never a Catholic president up until John F. Kennedy.Barrett is actually a really bad pick. I'll have to dig up the info but I saw that she always sides with big business against employees, with the police in 4th amendment violations, etc, and has signalled she will side with canon law, which could potentially become full communist (particularly in regards to immigration) under Pope Francis.
In my view, if we're supposed to celebrate "diversity" and people from "diverse backgrounds" and have underrepresented groups on the Supreme Court, then we should have a Baptist from the Deep South be placed on the Supreme Court. I can't think of a Baptist from the Deep South who has served on the Supreme Court in recent decades. Many of the justices have been Catholics and Jews from the North.