I got a strong feeling of evil there (Catholic too) when I went to a conference. My friend who is a born-again Christian and stayed there for a summer told me the same thing.
In the spirit of fairness, I'll mention something I also said on another NOLA thread. I went to a wonderful Easter Sunday Mass at the Cathedral that is right there in Jackson Square. I've actually been there twice at Easter, and the other time for a wedding, so maybe I've been a little protected. Mighty creepy vibe, and I grew up in NYC, so it's not like I was just freaked out by the city, or the bawdiness, or the freaks, or the criminals. Though I was sufficiently freaked out by the criminals to leave all my good jewelry home all times I went there.
Well, I doubt I'll ever be back to New Orleans. My friend, thank goodness, hasn't lived there for years.