So you are saying that people who have spent their entire life on studying Islam and by default other Abrahamic religions (for the most part) know nothing? People who are able to read all the primary sources written in Classical Arabic unlike you?
I have relatives that are Roman Catholics. So what? I know this religion/sect of Christianity well too. Saints, papacy, monks, celibacy, Constantine the Great, the trinity etc. I am quite well-versed in Abrahamic religions overall but I am of course no scholar or expert.
If you ask me (and I mean no offense) Shia Islam reminds me much more of Catholicism than orthodox/traditional Sunni Islam does.
No need to mention saints here, graves, a centralist clergy, worshipping/revering certain clerics (based on ancestry or rank) over others etc.
Anyway not sure what your problem is? Nowhere in this fatwa/opinion does it say that you are forced to pray in churches or synagogues just that it is legal based on precedent
I don't want to waste more time on this nonsense discussion. There are literally 1000's of topics that I would rather discuss and that I consider more important.