Is it permissible to eat the food of the Sabeans who follow the religion of Prophet Yahya, and what is the ruling on the food they buy from the market, such as cakes and fruits?

Scholars have differed in their description and ruling concerning the "Sabaeans," and the summary of the matter is that they are various sects. Whoever among them professes the religion of Jews and Christians falls under the ruling of the People of the Book. Otherwise, they are idolaters whose slaughtered animals are not lawful, nor are their women. Ibn Taymiyyah mentioned that the Sabaeans are two types, and Ibn al-Qayyim stated that the Sabaeans are multiple groups, among whom are the Ḥunafāʾ (monotheists), polytheists, and philosophers. The contemporary Sabaeans today—especially in Iraq—are predominantly idolatrous polytheists, and the proportion of those among them who profess the religion of the People of the Book is very small. It is not permissible to eat what the remaining Sabaeans slaughter today unless it is confirmed that the slaughterer among them professes the religion of the People of the Book. As for what they make, such as bread, sweets, or anything not slaughtered, it is lawful.