Christianity vs Islam

The Christian Cross, seen as a representation of the instrument of the crucifixion of Jesus, is the best-known symbol of Christianity. It is related to the crucifix (a cross that includes a usually three-dimensional representation of Jesus' body) and to the more general family of cross symbols.

Crescent moon and star atop a mosque in Singapore. ... The crescent moon and star is an internationally-recognized symbol of Islam. The symbol is featured on the flags of several Muslim countries, and is even part of the official emblem for the International Federation of Red Cross and Red Crescent Societies.