This is a multicache, the coordinates will lead you in front of the entrance of the church. Check carefully the little marble entrance. At the top left corner you will see engraved, the construction year in the form ABCD. Note these numbers, you will need them!
For the final coordinates you have to calculate the following:
xxx=2015-ABCD
yyy=457+xxx
The final coordinates are:
N40 39.xxx
E023 36.yyy
Happy hunting and be careful for muggles!