The German edition of Wikiquote contains the following alleged words of Napoleon (in translation):
I know men and I tell you that Jesus Christ is no mere man. Between Him and every other person in the world there is no possible term of comparison. Alexander, Caesar, Charlemagne, and I have founded empires. But on what did we rest the creation of our genius? Upon force. Jesus Christ founded His empire upon love; and at this hour millions of men would die for Him.
It cites Conversations avec General Bertrand à St. Helena as its source. A couple of things look odd about this:
While Napoleon sometimes referred to Jesus Christ as an emperor perhaps would, I understand his religious outlook was sceptic-to-agnostic. (After all, he grew up during the French revolution.) Napoleon may of course have reconsidered his believes close to the end of his life, but then he may not have done so. If he didn't the quote's language would seem a bit over-the-top.
The claimed source does not seem to appear e.g. in the online catalog of the Bibliothèque nationale de France. When I Google its title, this leads mainly to Christian sites in German (despite the French title). And other editions of Wikisource and Wikipedia do not seem to mention it.
So I am wondering: Is this perhaps part of a larger conspiracy to engross a prominent historical figure to a Christian cause, probably launched in a German-speaking country post-mortem. (Alternatively it could e.g. be an innocent mistake in Wikipedia, with distribution across sites by the usual copy-paste efforts.)
At the root of this inquiry lies the question: Did Henri Gatien Bertrand (who indeed accompanied Napoleon to St. Helena -- that much seems certain) or some other witness write Conversations avec General Bertrand à St. Helena and if so, where (online) can this source be confirmed and consulted.