Hi Tam,
I don't suppose its really that important, the Protestant and "other" Christian categories.... i divided Christianity up into three for my own curiousity really. Just wanted to get an idea of the Christian makeup of the website.

Its clear that Protestant/non-denominational is in a majority among the Christian denominations here. Thats not surprising, being a mostly American member website.
One thing thats caught my interest are the amount of Americans who do not identify with a denomination: they are "Christian", end of. This attitude does not really exist in Europe. Everyone in Europe knows their denomination and identifies with it. Americans when first asked about their faith will usually say "Christian" whereas a European will tend to say "Catholic", "Lutheran", "Presbyterian", etc.
Why this difference? I believe its the very different cultural history of our nations.
America was founded on there being no national church. Everyone was Christian, and all denominations of the time were supposed to be regarded equally. The creators of the USA clearly wished the avoid the demoninational conflicts prevailent in Europe at the time so they avoided creating a national church which possessed the "truth" on Christian theology. In Europe on the other hand, we had national churches: my own country for instance was (still it) Presbyterian. The national church was the only Christianity legally recognised, official, "truth". If you weren't Presbyterian you stood out and could face legal penalties. Many German states were either Catholic or Lutheran and fought with each other continually to enforce their "true" version of Christianity. Spain was Catholic and tried to invade and convert a number of Protestant countries to the "true faith" as they believed their national church to be, whilst publicly burning those Spaniards who were Christians (but not Catholics) as heretics. A simple belief in Christ as your Lord and Savior was not enough. England was (still is) Anglican, and they persecuted English Catholics with imprisonment and heavier taxes for centuries.
Meanwhile over the centuries different Christian denominations from within nation states themselves seized control of the national church of their states, civil wars essentially trying to force other citizrns within their nation to ditch their own denominations and join theirs, usually by force: Scotland for instance has been ruled by a Catholic national church which tolerated no dissent on Christian theology/interpretation, then Presbyertians (who behaved no better then their former persecutors), then Episcopals, then back to Presbyterians again (with plenty of internal wars as they fought for dominancy). Puritan evanagelicals/fundamentalists also sought to make their attempts at religious power. Usually not very pretty, because they were always tiny but fanatical minorities. However as a general rule, religious wars never are very pretty things.
What is the result of this European infighting among Christian demininations? Europeans still primarily identify themselves by denomination.
Americans on the other hand have primarily come to identify themselves as Christians, and as there have been no civil wars and bloodshed as rival denominations seek to create a national church in their own image ruling over all others, denominational identity has weaken in comparison to Europe. Simply put, American Christians tend to emphasise the similarities between them: Europeans continue to focus on the many theological differences and disputes that have led to a myriad of differing Christian denominations.
Thats what i think the reason is, anyway. It is really interesting.