Genesis 1: 26-27 “And God said, Let us make man in our image, after our likeness: (…) So God created man in his own image, in the image of God created he him.”
Men are created with foreskins. Therefore God has a foreskin. Therefore God is uncircumcised. Therefore God is not a Jew or a Muslim. (Christians haven’t been required to be circumcised since Paul hijacked Jesus’ movement and turned it into something for Gentiles.)
So why do Jews and Muslims (and others) vandalize their likeness to God? It seems irreligious. But maybe it’s just a very small kind of self-sacrifice; God required it of Abraham’s people as a sign of the Covenant – something very personal, and less drastic than killing your own son. In which case, Halleluia!