what?!? 45% of the Uk is atheist?  that is waay larger than i would have guessed.

According to a survey I heard on Bill O'Reilly: 

http://www.youtube.com/watch?v=5w8OhiLU7cU

From anecdotal evidence people of my age group, 16-20, the percentage of Atheists

is certainly higher than that (I would guess at 66-75%)..

I think it depends a lot of how much of a "strong" believer/practioneer the person is.

Here in Brazil people, in general, are very loose about their religion, and don't really like following strict rules. As a result we have many, many "weak" christians, most of them being catholic. It's so weak that a huge number of these people are catholic but also believe in spiritism or candomblé and things like that, even if they go directly against what the bibble or their church says. Kind of like robbers, murderes or dealers using crosses on their chests. So most people here don't give a crap about their partner's religion.

But some do. Some people (specially from baptist and also some evangelical denominations) take these things a lot more seriously and would surelly not even be in an intimate relationship with someone from a different religion, even if they're both crhistians. But these people, being a small minority, are seen as rather awkward when it comes to this habit.

So I think it depends a lot on the group you're looking at, but people who actually take their religion seriously would mostly not marry someone from another group.

Erm. There must be something... As I am a "Christian" is allows me to go to the school I am at.

It's illegal in the UK to have an educational institution which only allows students from a certain religion.

False. My school being a Church Of England school has a right to reserve 51% of the places for Christians.

51%. Thus, up to half of the school can be non-Christian.

Yeah....just reading over what I put, it would have been better for me to say: Being a Christian it virtually guarentees me a place.

Wrong again. It's non-Christians that are virtually guaranteed a place.

Lets say your school holds 100 people. 75 Christians want to go there but 49 Muslims and Jews want to go there too.

The school has to let all the Muslims and Jews go there and only 51/75 Christians get the chance.

......and no you don't get any official documentation for baptism/christenings. Maybe a few nice photos and a card from the priest.

If I got this right, it's not that only 51% of the students can be christian, but rather that 51% of the places are reserved for christians. So if there's some kind of selection for the places, everyone applys for that 495 that's not reserved but the christians can also run for those other 51%. At least that's how it works here on universities we're we have a reserve of places for poor and/or indian/black people.