The verse is general for everyone who has such a creed. At the time of revelation it included the Christians, the pagans who believed that the angels were daughters of Allah, and the fringe sect of the Jews who held that Uzair was the son of Allah.
عن السدي ... في قوله: وينذر الذين قالوا اتخذ الله ولدا قال: هم اليهود والنصارى
— Tafsir Ibn Abi Hatim
Before answering your questions, be aware that the recommendation on what to read and what not comes from ijtihad of the scholars and madhhab views that some times are a bit narrow. This isjithad is based on qur'an and sunnah and the practice delivered or reported by the sahabah and tabi'yn.
Secondly what you recite of the qur'an during the prayer in ...