Ike came later. But God blessed Ish's descendants at Abe's prayer, but the birthright was passed to Ike, who passed it to Jake, who passed it to Joe.
But there were no Jews til Judah had children.
Circumcision made foreigners Jews also. You have no basis for your claims. It says all leaving Egypt were circumcised. And they were a mixed multitude. Please get your facts straight.