
“Religious wars are basically people killing each other over who has the better imaginary friend.”
There is no known basis to attribute this saying to Napoleon. It is found (unattributed) in a Usenet post from July 1999 https://groups.google.com/forum/message/raw?msg=soc.penpals/QIUrpkacWyE/FbCj7pij5WwJ.
Misattributed