For many, being a Catholic nowadays is like saying you're a Star Trek fan. They feel the need to immediately caveat it with a denial that they're a "trekkie." I hear so many people talk of their Catholicism in a similar way.
Here's some of the more popular sentence I've heard start with "I'm a Catholic but..."
...I don't get crazy about it.
...I believe in science and think it was totally wrong that the Church burned Galileo at the stake.
...I think all religions are true.
...not in a religious way.
...I'm pro-choice because I don't think I can push my belief on others.
...I'm letting my children choose their own religion.
...I don't need an intermediary between God and me so I don't go to Confession.
...I support gay marriage because this is America and everyone should be free. Or something.
...I think the Vatican is evil.
...I believe in women's rights.
...I don't go to Church or anything.
...I'm a Catholic man and so is my husband.
I'd love to see more "Catholic buts" in the combox.