Business rates should be charged on business premises.
Perhaps so, but that sin't how the system works - business rates apply to all (see exceptions below) non residential properties, regardless of whether used for for-profit or not-for-profit (e.g. charitable, community purposes). All properties (see exceptions below) are assessed by the Valuation Office Agency periodically for a 'rateable value' and this used to determine business rates paid. If the property (see exceptions below) is used by a charity is then they are entitled to a reduction of 80% in the business rates paid.
EXCEPTION - all places of worship are completely exempt - they are not even on the Valuation Office Agency list so organisations running out of these buildings pay zero business rates. So if you run a charity operating out of an office building you pay 20% of total business rates, if you run it out of a place of worship you pay zero.
And actually it is worse than that - if you operate a commercial operation (e.g. a cafe, or a gift shop) within a largely charitable organisation building, e.g. a museum, you will pay full business rates on the space occupied by that shop or cafe. But as places of worship aren't even on the VOA list if you set up a gift shop or cafe within a church, you pay zero.
I don't know what you think that has got to do with Worship, congregation , charitable and community work.
See above and maybe you'll learn a little more about the special privileges that religion benefits from.