A good idea, but one very difficult to execute effectively. You know it's the moon because you took the picture. If you look at it objectively, tha moon could just as easily be a streetlight in the background. The problem is you're dealing with a VERY bright object, the full moon, and a relatively dark one, the church.
There are two other ways you could attmtp this which might afford better results. One would be to shoot it as an HDR - with say six images 1 1/3 stops apart, or for the absolute best results, shoot the church and the moon separately and then composite them together - who said pictures don't lie?
Just my $00.02 worth - your mileage may vary.
~John