[cake_crumb]

"I've only seen Buddhist temples on the news. I thought, but could be wrong, that Indonesia was mostly Buddhist."

No, mostly Muslim.

[sukhoi-30mki]

Firstly Aceh(the region hardest hit) has a lot of Christians(who were fighting a civil war) & sprinkling of Buddhists.Secondly,the architecture in Indonesia & Malaysia is a mixture of Buddhist,Hindu & Islamic styles due to their diverse religious history.Many mosques in the region resemble Hindu or Buddhist shrines.