Are there any sources for counting Druze men as part of a Jewish minyan?
I was talking to a Druze friend of mine a couple weeks ago, and the topic turned to religion. My friend is fairly knowledgeable about a lot of religion-related things (including for the Druze religion, Judaism, and Islam), and to my surprise he told me that technically Druze men can count in a Jewish minyan and that he's even done so a few times (in an Orthodox setting).
I presume this has to do with the origin of the Druze and the way that they count people as Druze or not (both of the parents have to be Druze for the kid to be Druze). However, I was unable to find any halachic sources for counting Druze men for minyan.
Are there any sources that back up what my friend told me?