If it's a Muslim holiday or a celebration of something related to Islam, nobody ought to have a problem with it. We say Merry Christmas and Happy Easter as Jeku points out. If you have a Jewish holiday you wish to celebrate/discuss, like Passover (I think) then there shouldn't be a problem right? We've had Ramadan threads before and they've been tame...except when somebody idiotically said, "I'm offended by Muslims", who was moderated as a result.
It's not as if this is a discussion on, for or against the religion, so it doesn't really conflict with AUP interests or the interests of the mods. This forum attracts people from diverse backgrounds, so all religious holidays should be allowed a thread (or none).
Though I don't know much about Islam, so I am unsure as to what leosmontu is referring to/advertising - so maybe somebody could educate us.