"At the age of seventeen, Napoleon's religious views started to coalesce, and they did not changed much thereafter. Despite being taught by monks, he was never a true Christian, being unconvinced by the divinity of Jesus. He did believe in some sort of divine power, albeit one that seems to have very limited interaction with the world beyond its original creation. Later he was sometimes seen to cross himself [an explanation for the non-Catholic: as in making the Sign of the Cross] before battle, and as we shall see. He certainly also knew the social unity of religious. But in his personal beliefs he was essentially an Enlightenment skeptic." (Napoleon: A Life by Andrew Roberts, emphasis and explanation by myself).
If Napoleon is anything, he was a child and firm believer in the Enlightenment. He poured over literature and held a belief in science over religion. The "Enlightened skeptic" that's Napoleon was is what many of Americas Founding Fathers believed in and many other "Enlightened skeptics" agreed with, Deism. Deism is the belief that God created the universe and left it alone, often describing God as an engineer or a clockmaker, an individual that created and doesn't actively intervene in the Universe. Further, it argues against Revelation and miracles, a mechanical deity doesn't give to a human theological truth nor actively moves to help humanity.
Further, for Napoleon, religion was a party of society and as a means of moral education: "The idea of God is very useful to maintain good order, to keep men in the path of virtue and to keep them from Crime." (Ibid). During his invasion of Egypt, he entertained the thought of a conversion to Islam to ease his rule over the Egyptians, however he would press to be anointed by the Pope as Emperor of the French. Religion wasn't a belief for him but rather a means of social performance, one that he used rather well.
Edited for errors