Your church will have personal data on a variety of different people such as church members, visitors, ex-members, alpha course attendees, community groups, to name just a few.
You need to have a lawful basis to record and process the personal data for each of these individuals.
Within iKnow Church you will easily be able to record which lawful basis is being used for storing a person's personal information. A warning message will show next to a person's profile if they have not had a lawful basis recorded.