The options available, are:
The decision is yours, but please, keep your local policing team informed. Be aware that leaving the premises open and unattended renders the risk of theft and damage more likely.
If you decide that your place of worship is to be kept open during the day, you should always ensure that valuables, if not removed from the building, are locked away in a secure area which is protected by doors fitted with good quality locks and a security alarm.