All Muslims should renounce their religion immediately in favour of Christianity or atheism - it would be better for them and for everyone else, controversial Dutch politician Geert Wilders said in Melbourne on Tuesday.

Insisting politely that he did not want to incite or offend anyone, the anti-Islam campaigner described the prophet Muhammad as ''a warlord, terrorist and paedophile'' and urged Australia to ban the Koran and all migration from Muslim countries.

Told that Premier Ted Baillieu had advised Victorians to ignore him, Mr Wilders said the Premier could ignore the threat of Islam and ''sing Kumbaya'' all day long, but the voters would wake up eventually.

Mr Wilders was speaking to the assembled media at a secret location 40 minutes' drive north-west of Melbourne, of which they were notified only in the morning.