I'm Catholic.
I've found that many people who call themselves religious distrust the Catholic church. Which usually leads to interesting conversations, where the Christian at the table and the non-believer find common ground against the Catholic church.
Lets see - why do I like it? Its a place where you can go, not just once a week but at any time, and find common ground with alot of different people. Its a safe place to bring up young children, with many very good values instilled. Finally, and I'm sure alot of you are going to insert your own joke here, but Catholic priests are very amazing individuals. Many have literally thousands of parishoners - and they are wonderfully understanding, energetic, and helpful. Ever REALLY struggled with something? Try having a guy around who really cares about guiding you (its his job) and is absolutely sworn to secrecy.
Frankly, I'm a little surprised when I see religious topics on TFP. I respect all opinions, but opening up a religious thread tends to invite some *interesting* responses.