As far as I know, as per the article mentioned by
@dualmeister - while the church's "religious activities" aren't taxed, if they pay a minister he should still pay income tax. If the church owns a shop selling books or coffee or whatever, that shop should still pay tax as normal.
If these are not happening then it's not a change of law that is needed but a proper enforcement of the current law.
The church I attend has a lay ministry (i.e. no paid clergy) and I would like the donations that I make go directly towards helping the poor, I don't care for SARS to skim them first.