>>17910339
If your issue is the affiliation I think there are two things confusing you here. One thing is most people are not all that informed about what the groups they are part of advocate for. Tons of Christians don't even go to church regularly, they have no idea what they are and aren't supposed to believe. This isn't just a problem for religion, plenty of people support political parties who don't want the same things as them because they just aren't that informed. In the United States for example, you can very easily find polling that shows both Democratic and Republican voters support things their parties either don't support or actively work against.
The other thing is, affiliation in this sense is, to quite a large extent, something you are basically born into. Their parents were Catholic, so they're "Catholic". Again, this is seen in politics as well. Plenty of people just vote for the same party their parents did for no reason other than that's just what they do.
In short there is not a lot of thought going on here. I'm not trying to denigrate these people, that's just what it is. It's a very passive form of belief.