Sister, actualy I know what the answer of my question.
Not only in this forum, looking for Indonesians in other ENGLISH Islamic forum is difficult. That is not because they have yet discover this forum or another English Islamic forum. When I visited Indonesians Islamic forum, I found they knew many English language Islamic forum in web, and sometime they visited these forums, they read many posts and even they made a discussion about posts in some English Islamic forum.
But why they never joined ?. That because, for many Indonesian, English is a 'scary language'. A tipicaly of Indonesian people is, they usually have low esteem and feel inferior if they must speak English. If you read posts of some Indonesians you can find they said "My English is not good".
I had an interested to joined this forum since the first time I found it, but I waited one month before I registered because I felt inferior with my English. And after I had registered, I need 24 hours to made my first post in introduction section.
In Indonesia is not difficult to find Muslims people who can not speak English but can speak in verry good Arabic. They are graduates from Islamic schools.
I have visited an English language culture (non religious) forum, and I found many Indonesians. But majority of them are non-muslims. No wonder, those non-muslims were prepared to study in foreign countries.
I often find Indonesian learn English in an English course but never learn longer than 3 months or even 2 weeks. This is a fact.
Oftenly, my friends ask me " How can you joined in English language forum if your English is not good ? ".
And I always answer " I know my English is bad, but that is not a problem. They always understand why I am talking about ".
Frankly, I have two reasons why I joined in LI. First, I want to meet my Muslim brother and sister from other countries. Second, I want to learn English.
Thanks for your response, Sister. Jazaka Allahu khairan.
