kek, nobody mentions their religion
she simply follows the customs (not Islam itself) for her parents, the only one who is really Muslim per se is her brother but between that he is a neet and that he left home, well, Islam is hardly something that is "mentioned"
removing the title of "Muslim" would be very damaging to Marvel because that is how they sold to Kamala in the first place, but people want Kamala more for their attitude than for their faith
So she is in limbo, I want to see what happens to her in the future, many other people too
besides, it's cute