Being a “communist” is good cover if you are Muslim and no longer believe or you wish to convert. In Muslim countries if you come right out and say “Allah isn’t real and Mad Mo was a nut.” you are a dead man. If those who know you don’t kill you then the Islamic governments come after you.
I’m not sure I fully understand Kurds, but what I’ve seen of them in the past and the ones I have come to know on the web are tough brave soldiers, they know how to kill ISIS, they have a reputation of doing what they say they will. So unlike most of the Muslim world. They also tolerate Christians and others among them and even risk their lives to defend those who cannot. What is not to like about them?