The topic of religious persuasion cropped up fairly early in my time at RAFC Cranwell. However, amongst our number were quite a few ex-'Super Techs' who'd been selected from their apprentice training to become officers. Thinking they were clever, they did a bit of investigation...
The CofE contingent had a weekly Church parade, inspection and marched to the god shop. The service went on for ages (brightened up only by the AssCom's pretty teenage daughter), then we marched back again - with luck we were free by mid-day at the earliest.
The church of jocks and others gathered a little earlier in the Junior Mess entrance, strolled to the CSFC church and were out again pretty quick.
The papists did even better - they just turned up at their church, mumbled some Latin and were done whilst we were still being inspected.
So our ex-Apps decided that they'd become RC. The left-footer god-botherer was amazed at this and was about to ring the Vatican or something. But he was quite young, so the senior CoE padre had a whisper in his ear.
As a result, the ex-App aspirant Romanists were told "Fine, but you will have to come to study religious instruction on Saturday (I think it was) afternoons". Strangely enough, most of them had a sudden change of heart.