Christianity is considered idolatry:
http://noahide.com/index.htm,
http://stopnoahidelaw.com/2020/10/01...r-noahide-law/.
The sublaws relating to the law against idolatry are covered on this page:
http://www.hasidicuniversity.org/ind...1_idolatry.htm.
An example of the sublaw "To acknowledge G-d's unity (that He is only One, and Infinite)" is "To reject any belief in a 'trinity.'", with the following sources (
http://www.hasidicuniversity.org/ind....php?mitzvah=2):
Rambam, Mishneh Torah, Avodas Kochavim 9:4 - Christian gentiles are idolaters.
Rambam, Mishneh Torah, Maachalos Asuros 11:7; 13:11 - Muslim gentiles are not idolaters (as opposed to Christians).
Rambam, Mishneh Torah, Avodas Kochavim 1:1 - The original belief in other powers as partners of G-d was a "huge mistake" by gentiles.
Kli Yakar, Shemos 20:8 - Having no false gods before G-d (mitzvah -1) was also addressed to gentiles, and they are obligated in it.
Rashi, Devarim 6:4 - The "Shma" (the source of this mitzvah) refers to gentiles ultimately accepting the unity of G-d.
First source (
https://www.chabad.org/library/artic...er-Nine.htm#v4): "The Canaanites are idol worshipers, and Sunday is their festival. Accordingly, in Eretz Yisrael, it is forbidden to conduct transactions with them on Thursday and Friday each and every week, and, needless to say, on Sunday itself, when transactions with them are forbidden everywhere."
Second source, 11:7 (
https://www.chabad.org/library/artic...Chapter-11.htm): "With regard to any gentile who does not serve false deities, e.g., the Arabs:[23] It is forbidden to drink his wine, but it is permitted to benefit from it. The Geonim rule in this manner. With regard to those who worship false deities,[24] by contrast, it is forbidden to benefit from their ordinary wine."
Second source, 13:11 (
https://www.chabad.org/library/artic...Chapter-13.htm): "It appears to me that anywhere in this context that we have stated that our wine is forbidden to be drunk, but it is permitted to benefit from it because of the possibility that a gentile touched it, we are speaking about an instance where the gentile is an idolater. If, however, the prohibition has arisen because of a gentile who is not an idolater, e.g., an Arab,21 who touched our wine unintentionally or tapped the top of a barrel,22 [the wine] is permitted to be drunken. Similar laws apply in all analogous situations."
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