There you go again, all arabs descended from Ishmail? LOL<quoted text>
Circumcision was nothing new to Arabs. It was a custom of all Arab tribes, who descended from the line of Ismael.
Any proof? Of course you have nothing, but the nothing is enough for you to believe it, because "Islamic history" said so. Who cares about how reliable are the sources used for the so called Islamic history!?
Abraham lived much less 4000 years ago. Genetic tests are made to almost all world's population, therefore arabs too, and none of the studies conducted on them have pointed out to a common ancestors who lived in that era.
IOW, you believe in BS and entertain us with it.