Perhaps someone can correct me if I'm wrong, but aren't Muslims prohibited from making friends with Christians and Jews, and if a Muslim does befriend a Christian or Jew doesn't he become "of" or "one of" us?
Try clicking on the link. The majority of translations at that site use the term "friends", and most of them appear to be pretty clear on the matter, but since I don't read Arabic I can't know if most of those English translations are good or not.
I suppose you could cherry pick, to serve your own desires, but according to the most widely quoted (in the U.S.) Yusuf Ali translation, for 5:51:
Sura 5:51 "O ye who believe! take not the Jews and the Christians for your friends and protectors: They are but friends and protectors to each other. And he amongst you that turns to them (for friendship) is of them. Verily God guideth not a people unjust."
You're wrong and were already corrected, but I thought I'd point out that in the link you have provided, there are translations of the term being used as "protectors" "sponsors" "allies". You seemed to have done some cherry picking yourself to try and serve your own desires (you know, the very thing you accused others of doing). With all those different translations plus the many other verses in the Quran which speak on such matters and with a little bit of common sense, the answer is pretty clear.