How exactly would you go about enforcing whatever sentence was passed on him? I can see there'd be a moral satisfaction in having a fair and impartial court find him guilty of diverse atrocities and war crimes, but if you want anything more concrete than moral satisfaction out of the exercise then I think first you have to find a way to (e.g.) ensure he stays arrested.
Mortals get tried in absentia, so it's not entirely unprecedented to get a judgement that you can't currently enforce.
Also, getting enough evidence to actually secure a conviction would imply quite a lot of new facts discovered compared to now; perhaps along the way we'd find out something useful for sentencing, too.
We could start by putting the devil on trial and getting god to give us information about how to imprison supernatural entities...
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Mortals get tried in absentia, so it's not entirely unprecedented to get a judgement that you can't currently enforce.
Also, getting enough evidence to actually secure a conviction would imply quite a lot of new facts discovered compared to now; perhaps along the way we'd find out something useful for sentencing, too.
We could start by putting the devil on trial and getting god to give us information about how to imprison supernatural entities...