What is your evidence that one or both of the women is not Muslim? It looks like they are all Muslims. What am I missing?
http://www.latimes.com/local/lanow/la-me-ln-enrique-marquez-rifles-20151209-story.html
“Marquez, an HIspanic convert to Islam, married Mariya Chernykh in November 2014, according to county records. The marriage added another connection to the Farook family; Chernykh’s sister was married to Syed Raheel Farook, the shooter’s older brother.”
IIRC both the Chernykh sisters seem to have been Russians doing the marriage-immigration thing.
Maria was living with a different Mexican fellow (named Romero), presumably not a Muslim, and had a baby by him while allegedly married to US citizen Marquez.
I suspect her sister Tatiana was in the same arrangement with the older brother of Farouk.
Marquez was just a Mexican-American flake and patsy that fell in with that lot.