Christian is a broad term for those who believe and follow the teachings of Jesus. Catholicism is a sect of Christianity. More simply, they are a type of christian who are suppose to have, or follow, a similar interpretation of the teachings of Jesus. So basically, not all Christians are Catholic, but all Catholics are Christians.

I've heard that called lying "Spread Eagle" in the states

First of all i don't think accept is the right word. It makes it sound like they are close minded about it. It's probably more accurate to say they dont understand the joke. Humor is cultural. Even within Western countries there are differences in opinion on humor. British humor is very different from American humor. Without the cultural framework, its not easy to understand the joke.

it doesn't really matter, besides a few different use of words its the same language. the only thing that might be a consideration is if your going to be interacting with british or americans more. then you might choose one or the other because of that.

Both the answers before are right when they say that there is no real difference. However in common American usage they are somewhat different. We don't use "must" very much and using it sounds a little odd and old. In general we always seem to use "have to" instead of must. The only time i ever really hear "must" used is for dramatic orders in a play or something. So in a play one person might be trying to convince someone else to do something 1st person - "i dont want to rob the bank" 2nd person - "You MUST!"

Americans in general are not very interested in learning a foreign language. they may study it but never really learn it. from my experience, Chinese learning has increased a little but not very much in the states. Also the types of chinese people learn can be simplified characters and mandarin to traditional characters and cantonese. my university taught mandarin and traditional characters. your first question about what happened is not clear. i dont know what you are asking because there is no object.

well the famous foods from the united states are probably already well known by you. Burgers, pizza and hot dogs are seen as the famous american food. However you have to understand that America never really had to develop its own type of food since we are a immigrant nation. we took the food from everywhere that people came from including china and eat that. most of our food is variations of other nations food including the famous hamburgers pizza and hot dogs.

there are too many different types of cheese to simply list or give a number. also you cant really judge a cheese by its appearance because its appearance will not tell you its flavor. though there are many that look similar they may taste very different. Trying them would be the only way to find one that you might like. its hard to suggest a cheese without knowing your preferences.