One of the issues about Christianity that come up in the Rambam is that of idolatry. The problem is that most any type of religious worship involves going to God through some kind of middle step.
It is rare that people think that just by learning Torah and keeping it that they will be doing OK. The entire religious world in fact usually is worshiping some kind of human.
The question rather seems to be who really is connected with God. Who is from the realm of holiness.
In any case this come up in tractate Avoda Zara in Tosphot. [I forget the page-but it is where the issue of "joining" comes up.
It is rare that people think that just by learning Torah and keeping it that they will be doing OK. The entire religious world in fact usually is worshiping some kind of human.
The question rather seems to be who really is connected with God. Who is from the realm of holiness.
In any case this come up in tractate Avoda Zara in Tosphot. [I forget the page-but it is where the issue of "joining" comes up.