That's very good of you. Maybe they do it because their moral code is guided by their religious beliefs? Personally I do some charity work run by the local church - I act as a taxi service for the local aged population for whom the church runs a monthly Sunday lunch. I'm not religious...
https://en.wikipedia.org/wiki/Chancel_repair_liability
"In the vast majority of ecclesiastical parishes (into which all of England and Wales is split) chancel repair liability is not applicable. However it was brought into use for the first time in a few years in 2003 in a particularly lightly...
It depends on the age of your parish church:
http://www.bbc.co.uk/news/uk-england-26373756
"Under chancel repair liability, homeowners living within the parishes of churches built before 1536 can be held liable for costs."
I'm agnostic, but I do recognise that the church does a lot of good and should therefore be a tax exempt charity. I think the "discrimination" argument used against the church is very flimsy. They don't discriminate who uses church facilities to shelter from the cold, they don't discriminate...