Two things: Firstly, Islam doesn’t have a symbol that represents it in the same way that Judaism and Christianity do. And so, I object to the idea that the Star and Crescent is a sigil.
The Star and Crescent for example, was originally the flag of the Ottoman Empire in the nineteenth and twentieth centuries. The First Kalima is also a very common symbol, it’s a calligraphic representation of the Arabic words which mean, “There is none worthy of worship except Allah and Muhammad is the Messenger of Allah.”
Second, @Lady_Eva already killed God, and so you should talk with her about that.