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Say you have a Christian* or a Muslim (or a member of any other monotheistic religion) who accepts the Seven Noachide Laws, and (as per Mishneh Torah, Hil. Melachim 8:11) does so because he believes that G-d (re)gave them through Moshe.

However, he also continues to believe ideas from his own religion that are against the Torah or even inimical to it, such as that most of the mitzvos are no longer applicable (for anyone, Jews or non-Jews) after the crucifixion, or that the Torah as we have it is corrupt and that the Koran is the true revelation of G-d's word, etc.

Would such a person still be considered a righteous gentile? True that Rambam says (ibid. 10:9) that "we are not to allow [gerei toshav] to innovate a religion and come up with their own mitzvos" - but perhaps that refers specifically to rituals and ceremonies, not ideology. On the other hand, one could argue that such beliefs make the acceptance of the Seven Laws incomplete.

* That is, according to the views that shittuf is permissible for non-Jews.

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+1, nice question. But re "he believes that G-d (re)gave them through Moshe": that may perhaps be too strong. The Rambam says "והודיענו על ידי משה רבינו שבני נח מקודם נצטוו בהן" which, if I understand it correctly (I haven't checked the nos'e kelim), means merely that he believes God gave them (viz earlier) and mentioned, through Moshe, having done so. No? – msh210 Nov 14 '11 at 21:17
@msh: you're right, that does seem to be the obvious understanding of what Rambam says. Still, though, to salvage what I wrote, I see where Korban Chagigah by R. Moshe Galante (linked there) seems to understand Rambam as actually requiring the ben Noach to be aware of both facts: that Hashem commanded them in the Torah given to Moshe, and that Moshe informed us that they were previously obligated in these mitzvos (דצריך שבן נח ידע שה' צוה הז' מצוות בתורה ע"י משה... שעוד ידע שהודיענו ע"י משה שבני נח נצטוו בהן מקודם). – Alex Nov 14 '11 at 23:38
I don't see anyone on the linked page who says believing in a shittuf-God(s) is permitted for a non-Jew. – Double AA Jan 18 '13 at 21:48
Related: judaism.stackexchange.com/a/48952/5083 – Matt Jun 16 '15 at 0:43

The Midrash Mishnat R. Eliezer (which is the source of the term חסידי אומות העולם, and for the Rambam's controversial definition thereof) says about this:

חסידי אומות העולם, כיון שהן עושין שבע מצוות שנצטוו בני נח עליהן, הן וכל דקדוקיהן, הן נקראים חסידים. בד"א כשעושין אותן ואומרין, מכח שצוה אותנו אבינו נח מפי הגבורה אנו עושין, ...אבל אם עשו שבע מצוות ואמרו מפי פלוני שמענו או מדעת עצמן, שכך הדעת מכרעת, או ששיתפו שם ע"ז, אם עשו כל התורה כולה, אין לוקחין שכרן אלא בעולם הזה

R. Abba Mari ha-Yarhi, in his ספר הירח, פרק יד says that we cannot hold Aristotle accountable for not believing in creation, because after all that is not one of the 7 מצוות בני נח:

על כן אני אומר על ארסטו כי עינו הטעתו בראותו עולם כמנהגו נוהג גזר ואמר כי כל חלוף דבר מטבע נמנע והביא ראיות על הקדמות ואין לענשו על כך כי אין זה מכלל ז' מצות שנצטוו בני נח

This is also the implication of the תשובת הרשב"א ח"א סי' ט, in which he says he does not fault the philosophers for believing things against the Torah because they have no prophecy or tradition about these things:
ואני איני מאשים אחד מן הפלוסופים בבטלם הענינים האלו כלם לפי שלא יכריחם דבר נבואי ולא קבלת חכם מחכמיהם

According to some acharonim, e.g., Pri Megadim, and R. Refael Hamburger (ושב הכהן סימן לח) even though שיתוף is permissible for a Noahide, it is not for a גר תושב.

R. Mayer Twersky also wrote an article on this subject in which he cites the Chazon Ish who has a ספק about this. At the end of the article (pp. 530-531), R. Twersky claims that according to the Rambam, בני נח would have to accept the 13 עיקרים. However, he admits what he is saying is a chiddush, and it does go against the Rishonim cited above.

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Please incorporate the relevant point(s) into your answer. – Seth J Nov 15 '11 at 21:39
-1 until you incorporate what @SethJ suggested. – Adam Mosheh Feb 12 '12 at 15:15
Wow, welcome back, and thanks for the follow up! +1, and I'd give you another if I could just for returning to finish the task. – Seth J Jan 17 '13 at 20:25
@SethJ That's ok, I've got you covered. – HodofHod Jan 18 '13 at 5:11
@AdamMosheh When you return please note the recent edits in light of your above comment. – Double AA Jan 18 '13 at 21:55

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