If you want to have an effective partnership with a local church, it will be very important early on in the process of building the school-church relationship, that you take the opportunity to invite church leaders into your school to get to know you and the school.
Some church leaders will be very familiar with working in schools or have school-age children themselves. For others, your school may be the first they have visited since they were a pupil, and school experiences are not always happy memories for everyone.
Don't assume that church leaders or members necessarily understand the type of school that yours is, nor how schools work. Things may well have changed since they were at school. Education jargon changes from week to week, so try not to use it without explaining what the letters stand for (is your SIP your School Improvement Partner or your School Improvement Plan?)
Have a pack of information to give them at an initial meeting; take them on a tour of the school to meet staff and pupils, and just to get the physical layout clear (this can be very effectively done by older primary pupils or secondary pupils, rather than the headteacher); and try to set the school in the wider context of the education system of the UK. It will help them to know age range of pupils, type of school and the area the school serves.
Discussing how your school can work effectively in partnership with a local church will follow naturally once you have established a relaxed relationship during an initial visit. Not all church leaders will have the gifts to contribute to your school, so make it clear that other suitable people from their congregation will be welcome.