I think the headline is deceiving, obviously 600,000 people did not confess to radical acts. It was 1200 people surveyed and apparently only 5 people responded they had been involved in radical acts. 0.4% in a survey that claims a 2.6% margin of error.

And how did they define "radicalism acts" for the survey? To me that sounds like beatings, arson, or worse. The article says a radical act would include "conduct a protest against the group that is considered as a threat to Islam’s sanctity"
New headline: "0.4% of Indonesian Muslims surveyed claim to have ever taken part in protest against groups opposing Islam"
