Since you clearly have no idea whatsoever about what the catholic church is and is not: the difference with some other denomination does not consist in the fact that only one person talks on God's cell phone each Sunday morning rather than each pastor rather than any believer that can manage to dial His number.

It's rather more on allowing any nutcase to form and teach his personal opinion on a huge book written in a variety of very ancient language, by people from a very different culture (one could argue about Paul, but everyone else was definitively a Jew), missing all vowels and with huge chunks corrupted beyond any hope (I know, some people say that KJ was God inspired; that belongs to my definition of nutcase). Catholics opted for letting only experts deal with the Bible; Lutherans opted for educating people (clearly the wiser thing to do, in the long run); some others opted for the nutcases. Thanks to God most of them gathered in the USA.

1. A contract to be valid requires that both parties agree and understand what they're into. Your friend was made to believe something different that what she could reasonably expect. We had similar scams going on for a long while (you thought you were signing to support something, while actually buying a 2000 euros encyclopedia): whoever went to court always won.
2. Almost anything which is not bought in a physical store can be returned for whatever reason for the following ten days. This follows from EU directive 85/577/CEE (which states a minimum of seven days)
3. In order to agree to mean stuff the law requires you to be really sure you're agreeing: here you have to sign twice, in France you have to hand write "lu et approuv'e", i.e., "read and understood"; most likely you have something similar in Germany, which could help. BTW this means EULAs have essentially no chance to survive in court.

So what I'd do would be to call the legal service of my consumer association now