[edbob]

I think I know why you're saying that, but at least in Texas most people who identify as Christian aren't really aware of the differences between groups. If one believes that Jesus is God, it doesn't matter if they even go to church at all, or if they go to evangelical or Catholic services. It's all considered Christian, and social circles often include people from vastly different denominations.

[pseudalopex]

Most Christian groups don't focus on converting other Christian groups. That doesn't mean they don't know the difference between Catholic and Protestant.

[edbob]

Sure, but they are mostly seen as superficial differences that people don't much care about in practice. One might not want to go to Mass because they prefer the style of a modern evangelical service, but they couldn't care less if you go to Mass and have no interest in converting you to their style. As an example, Catholics who move to a new area might start attending a Methodist church because of the similarities in services. I'm sure many of the leaders are aware of the deeper differences, but among the people not many care.

[pseudalopex]

Let's just say we know different Christians.