OP, you really need to get some very clear information on how exactly this process is working. WHO told you the school rank the applications on "feel"?! This seems completely bizarre and there has to be some kind of ranking criteria. Many schools rank on the basis of the supplementary form information only and e.g. for our local Catholic school, this relates only to church attendance with different tick boxes for weekly/monthly/occasional attendance. It doesn't matter how many choirs you run, or how many times you do the flowers, that doesn't count. The reasoning behind that is that many people are not in a position to do those extras because of shift work, disabilities, caring responsibilities etc and should not be penalised for that. Attendance at services is the basic requirement for calling yourself a member of that faith and parish, so only attendance is ranked.
When you say they rank the places, are you now talking about the waiting list? As this is a secondary school, there should be somebody specifically tasked with managing admissions and you need this person to clarify (preferably in writing) exactly how the ranking is determined and how you have ended up in your current position.
One thing that I'm not sure was asked or answered is whether this school has feeder schools and if your child attended one of these? If there are feeder schools, you may have ended up in a lower category even with your church attendance.
I'm still not convinced that there hasn't been some mistake here and that you haven't been mistakenly placed in the wrong category. I know you didn't want to identify the school but there are some very knowledgeable admissions experts on here, one of whom I'm sure would have a look at the admissions criteria if you sent them to them by PM.