Brian wrote:...being a Christian doesn't mean following Christians. It means following
Christ. Did she sleep through church that day?

I think she knows exactly what she said..
I believe that she's accurately reflecting the unspoken/spoken mentality that the vast majority of US Christians have -- if you're not IN church with us, and ostensibly agreeing with the opinions that the majority of us hold (including things that are not even remotely addressed in the Bible), then, you're not a "real" Christian.
I have encountered that attitude in the mindset of hundreds of Christians from more than 100 different churches I've had encounters/membership in/dealings with in the last 40 years. I had many many conversations when people would start talking about conservative views, homosexuality, and the other types of things she mentions and more --- And the words these people utter may not be militant, but you can see that their opinion is "thus" -- and once they realise that your opinion isn't the same as theirs, suddenly you're "not the same" -- and in Christianity especially, where every thought and opinion is directly related to "being saved" or "not being saved", there's an instant chasm between believers at that point.
It's one thing when it's a difference between you and your neighbor over the kind of grill to buy.
It's something else entirely when you are willing to be friendly towards a gay person, even though you don't accept their lifestyle, you're capable of looking beyond that...
...and the other Christian in the room is NOT willing to be friendly, and has immediately decided that YOU are going to hell and are a false believer in Christ, all because you're not willing to be as intolerant as they are.
Sometimes they're not outwardly militant about it -- but once they realise you don't 100% share their narrower views and mindset, they're just not anything like warm and friendly and welcoming -- all the while talking about being loving and warm and friendly.
I agree that only a smaller percentage of Christians will be militantly outspoken to a fellow believer.
But my experience is that the attitude Anne Rice is talking about is there, and many times it's just politely unspoken, yet you can see it's results in other more sutble ways.
There are exceptions -- two of my good friends are staunch in their ultra conservative beliefs and yet very friendly with people who are not
But I do feel that from empirical experience, they are very very much the tiny minority, NOT the rule..
Most Christians do make a large mental equality divide in their minds between themselves and ANYONE who doesn't share exactly their views --- because at best, that other person with broader views is deluded and isn't going to be in heaven...
..or worse, someone with truly broad views is probably working with Satan...