Mr. Obama recalled the opening lines of the Arabic call to
prayer, reciting them with a first-rate accent. In a remark that
seemed delightfully uncalculated [...], Mr. Obama described the
call to prayer as "one of the prettiest sounds on Earth at
Send treats to the troops...
Great because you did it!
“fluent in Indonesian”
At his young age in Indonesia, he probably thought that all that Arabic he was hearing, and reciting, was the language of Indonesia. So, his statement is probably really an admission/claim that he was (once) fluent in Arabic!