I think it would be higher than 70% even. And I consider myself a "church folk" I personally would still be in church Sunday morning most weeks if hunting was open. Admittedly, I would skip for the Bear season on Sunday, there's only a few days a year to hunt them. But I doubt I'd skip any other services for hunting. But I would probably be hunting sunday evening. And just because I choose to be in church sunday, doesn't mean my neighbor shouldn't be able to be out hunting, or have his kid out hunting. I highly doubt not having Sunday hunting increases church attendance anywhere. I grew up hunting in Ohio, who allows sunday hunting. I would hunt in the morning, until 9, then run (literally) back to the house and be showered up and in my parents car by 920 to be headed to church.
-Jake