Then they should renounce Islam!
Many Syrian Kurds have.
Some are Christian, have been for some time.
Others are atheists. Product of PKK influence.
Some are still Muslim, but I don’t know one in Syria that is an Islamist.
Some like the Alevi’s have been secular concerning their neighbors for ages. That is why they were targeted by the Islamists. They got same treatment as the Armenians.
There was a community of Alevi’s in Efrin. Along with Ezidi and 2 Christian Churches.