The holiday itself is originally meant for a day of reflection. I know the majority of people in today's society and beliefs don't give a toss. However Good Friday wasn't meant to be exploited for a money grabbing football spectacle.
As far as I see it either:
Scrap the good friday holiday and play football.
OR
Keep the for holiday what it's meant for and give footy a miss for a day.
However I will say, if the money made by a good friday game does go directly to the RCH appeal, then this is a decent comprimise.
The afl should be in no way dictated to by any religious event as it should be a secular organisation. You can still have the public holiday and play footy, if 2 day a year christians want to reflect then by all means do so