Historically, the jizya tax has been understood in Islam as a fee for protection provided by the Muslim ruler to non-Muslims, for the exemption from military service for non-Muslims, for the permission to practice a non-Muslim faith with some communal autonomy in a Muslim state, and as material proof of the non-Muslims' submission to the Muslim state and its laws.
https://en.wikipedia.org/wiki/Jizya
Muslims might let Christians practice Christianity to some degree with some restrictions