I've heard of Authonomy and Wattpad for ongoing fiction (I take that to mean that you want to write long fiction and update it in instalments?), but I haven't used either one myself. Authonomy does look interesting, though. I don't know of anything specifically for Islam but there's bound to be a site out there: it's a huge religion, somebody's got to be catering to it.
In that case, I probably would recommend Authonomy (though I should mention that I haven't really even looked at Wattpad yet). ^neurotype is right about it being aimed at people who intend to publish, but they seem open to works in progress and the site makes long fiction easy to read. I think that, as long as it was your best work, it would probably be acceptable to share it there.
True, but it's also good for long fiction in a way that deviantART, for example, doesn't seem to be. I guess you could upload a novel here as a PDF, but having to scroll through is a bit of a nuisance: I remember Authonomy using separate "pages" of prose and generally being easy on the eye. Also, I was under the impression that nobody really got published as a result of uploading their work there.
I am aware of live journal (free) and wordpress (paid?). There is some other site someone told me about but I forgot the name of and I am having them get back in touch with me about it. The name of it was something like wattpad... I am more interested for fiction and poetry than the theological stuff since it is so specific.
Well I have to admit I didn't look around all that much. Page I open to was about different subcriptions options. Is it like DA in that you can joined for free and than there is options for subscribers.
You can post those things on literally any blog-friendly website, so also Blogger, this site...whatever. For religious stuff, Google? I'm not familiar with what's out there, although you can still post that content on Wordpress or whatever.