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One of the greatest values of the small local churches, in my opinion, is that they epitomise the very best of English culture. Architecture, music, tradition, community, service, and history.
(Don't know much about Welsh, Scottishor Irish church culture.)
Even an ardent atheist must see their worth and place in the very foundations of our culture.
The growing influence of Islam will in my opinion, through insidious influence in the ecumenical and legislative authorities, threaten eventually these precious local resources.