actually i have something more important to bring up: damian is not muslim. nor is ra's. nor does the league follow islam. the more i dig through just where and when historically ra's & his origins are, the less it makes sense for them. ra's was raised by nomads, sometime before the turn of the first millenia. since dc doesn't do their research, this should actually place him in a nomad tribe around 500-600 BC/CE, not around 1000. the majority of the pre-islam tribes that wandered the arabian peninsula ( like his origin states: "he was raised by nomads but was fascinated by science since a young age" ) were predominately christian or non-religious. in the case of the al ghuls, i highly suspect they were part of a christian one given ra's naming the life-giving waters a lazarus pit.

ra's ( and his mother who he revived then locked away for thousands of years and his father that he kept alive until the 1980s-90s~ ) was born and raised before the rise of islam. i haven't pinpointed the right tribe for him but the majority of them initially opposed islam and even fought against the early adopters.

to assume ra's is willing to follow an organized religion or dedicate his literal cult of followers to it is a little blind to his very character. especially considering he sees himself as an immortal god thanks to his literal resource to bring the dead back to life. he has conquered death. he has power, wealth, followers: in his own eyes, ra's is a god himself.

for his family to be raised under this atmosphere, it is exuberantly ignorant to just see them and go ' hehe dami is muslim :) ' just bc he's arab. arab =/= muslim. given his upbringing, his family, the cult he grew up in: he's not.