Khalid Nassour is a muslim superhero: it's explicit in the Doctor Fate (2015) series and in Young Justice. It doesn't come up in the Justice League: Dark series, but I think DC used a picture of him from it for a Ramadan post.
It's a bit of a thing since Khalid is a muslim character who uses magic, but he has muslim fans that are happy about the character and I have been told "magic is haram" does not apply all across the board, so to speak. I've also been told that he avoids some of the pitfalls that comes from the "magic muslim" type because his magic is not derived from Islam and he specifically gets his magic from the white side of his family.
EDIT: Found the Ramadan post.
https://twitter.com/dccomics/status/1381759040338944001