UNCIRCUMCISION = NOT BEING IN COVENANT RELATIONSHIP WITH YHVH

Jeremiah 9:26 Egypt … and Edom and the children of Ammon … for all these nations are uncircumcised …

1 Samuel 17:23 And as he talked with them, behold, there came up the champion, the Philistine of Gath, Goliath by name out of the armies of the Philistines and spake according to the same words: and David heard them.

1 Samuel 17:26 And David spake to the men that stood by him, saying, What shall be done to the man that killeth this Philistine and taketh away the reproach from Israel? for who is this uncircumcised Philistine that he should defy the armies of the living God?