I haven't really seen proof that this is a genuine political statement. Having a "there's only one god" flag doesn't exclude that the bloke is having a psychotic episode or committing an act of violence against his ex at her work etc
The whole thing looks like an unbalanced, temper driven act by a lone dickhead: he's got no backup, no comrades and no right to sensationalist media coverage/publicity..
If he was that political, he'd already have an ISIL flag, he wouldn't need to ask NSW police to get one for him.