I refer to allusions. One's that exist.
"Save humanity from damnation, by the love of God." "Heavenly Father..." "The Word of God..." These are Christian expressions, mimicked by Cylons in BG.
Muslims are monotheists too.
While Christianity is monotheistic as well, the civilized world is not and is more accurately represented by the polytheistic BSG human society. When you consider the civilized world as a whole, Christianity is only part of it; throw in the Bhuddists, Jews, Taoists, Hindus, etc., and as a whole you have a human civilization that does collectively worship many gods.
There is a little bit of Judeo-Christian flavor to the cylons' monotheism, but it is tops one part in a thousand. The essence of the cylons, their goals, their beliefs, and their methods, these all are Islamic in nature. You can see this clearly in what happens to the "moderate cylons". The cylons are all about advancing their goals by force and deception, which is EXACTLY what Islam is about.