I'm well known on AB for being about as 'anti-religion' as it's possible to be, so I'm probably not the best person to be answering this but can I, at least, suggest that you seek out some cheerful tunes for the hymns you choose?
I attended two cousins' weddings within the space of a fortnight (on opposite sides of my family). The CofE service for one wedding was more like a funeral! They'd chosen 'Now Thank We All Our God' but, instead of choosing one of the up-beat modern tunes for it, they chose 'Old Hundredth' which (when sung by a congregation who couldn't find a right note between them) sounded more like a funeral dirge; the whole experience was totally depressing!
The other cousin's wedding (in a 'happy clappy' church) was totally different. The first thing people noticed when arriving for the service was the 256 channel sound mixing desk! The choir of youngsters were really in a lively mood as they belted out "Lord of the Dance" and it actually seemed like a celebration of something.
I know that Catholic churches don't exactly do the 'happy clappy' thing. (My only recollection of attending a Catholic wedding was 2½ hours of sung responses and a lot of Latin. Most of us had been in the pub beforehand and had our legs firmly crossed throughout!). However surely ANY wedding ceremony should at least sound CHEERFUL, shouldn't it? So the nearest thing that your church does to 'bright and breezy' would seem to be a good plan to me!