Ciao Claudia,
Although, nana 1984's question was probably asked in sincere curiousity, if I had encountered this question on any other internet forum, I would have automatically assumed it to be a troll (that is: an attempt to elicit an irrational emotional response in others or draw out stupid arguments for one's own amusement). Variations upon "Which religion/ nationality/ political affiliation is best?" are a classic trolling method.
"btw, 5/10, OP" is an example of internet shorthand or code meaning, "If you, the person who started this thread, were attempting to "troll", it was moderately succesful."
btw - by the way
5/10 - a score of 5 on a scale from 0 to 10
OP - Original Poster (person who started the thread)