Losing tax exempt status to some great degree (by religious and dubious 'charities' for anything not expressly and truly charitable) would sure be a great way to "judge" the real charitableness of a religion. Are they generous and kind if they don't taxes abated? Would they think that the publishing was worth it? Would they remove every bit of church activity or charitable things that they value now if they were not getting all taxes removed? If they had to pay for land taxes and employment taxes for ministers and they didn't get anything beyond normal business deductions (another tax issue that needs to lose some wiggliness)-would they bother?
If actual PREACHING activity was not tax deductible, but only actually feeding or housing, heaing needy people was-would churches bother with other 'outreach' activities? How would it work? I hope I live in a world sometime that knows!!