Documents required for muslim mixed marriage in Indonesia

[cestpasmyjob]

If a child did the aqiqah as a baby (and has the certificate) and is Islam on the KK, but in practice has never done or studied anything Islam-related because they follow the religion of the other parent, does that mean they are officially Islam or not?

Depends what they put on their KTP I guess. My wife switched to Buddhist a few years back, no one seemed to mind.