Islamic crescent moon with star (top), Christian cross (middle), Jewish Star of David (bottom). 
The majority of religious Islamic publications emphasize that the crescent is rejected, "by many Muslim scholars".[1]

↑ 
"many Muslim scholars reject using the crescent moon as a symbol of Islam. The faith of Islam historically had no symbol, and many refuse to accept it."
Fiaz Fazli, Crescent magazine, Srinagar, September 2009, p. 42.
Own work
Alex Microbe