Its research found that one in four churches will suffer from theft, vandalism or an arson attack each year.
David Parkinson, risk management technical services manager at Ecclesiastical said: "Whilst locking away silverware and valuable artefacts may be automatic, church members might not necessarily realise how attractive other items and contents can be to thieves."
"Items that can be used in a domestic setting such as benches and chests, smaller portable ornaments and items made from precious metals are also targets for thieves."
Parkinson said Ecclesiastical's research revealed strange items that have been stolen.
The ten most unusual items stolen from churches were:
1. Zorbing balls
2. A flat-packed shed
3. The ivory keys from a church organ
4. Umbrella stand
5. A bench
6. A church bell weighing a third of a ton
7. Wafer box
8. Wool
9. Boot scrapers
10. Minister's cloak
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