Man. Reading this just made something really sinister pop into my mind. Under Islamic law, a Muslim can not inherit wealth from a non Muslim. So without his dad's alleged deathbed conversion, Green, his two wives, and eleven kids would not have been able to touch a single penny of that huge estate.
Call me cynical, but given his reputation as an Islamic celebrity, he knows the only way he'd be able to partake in the fortune and save face with the public would be to claim his dad secretly and sincerely accepted Islam--as unlikely as that may sound--and then make it as public as possible.
I think you just nailed it.

Devious, treacherous, murderous, neanderthal, sub-human of the West.