In Spain a large majority of the market traders are Muslims and we had the magazines in Arabic for them. We were taught to highlight the similarities of the 2 religions. In 5 years not one left Islam to join the JWs.
One of the best bosses I ever had was Muslim and we had some great discussions in quiet periods. He was semi practicing. During Ramadan he sent me to get his breakfast and the Muslim bosses in the other shops got their British assistants (also JW) to get theirs. I never told my boss his mates (uncles and cousins) were breaking Ramadan and I don't think anyone apart from me and other JWs knew he was either. My boss even had one of my neighbour's puppies but here in UK Muslims dont have dogs and my daughter's Muslim friends couldn't visit her at home because we had a dog.
My granddaughter married a Muslim. He too was anti dog because of his religion but he smoked weed which I don't think he was supposed to. I think Muslims only shun if you stop believing but you can break as many rules as you like.
So many variations of rules and beliefs. You would think an all powerful all knowing God could get his various fan clubs to at least have the facts straight about His rules and displeasures. :p