15 We will enter into an agreement with you on one condition only: that you become like us by circumcising all your males.

Read Genesis 34:15 Using Other Translations

But in this will we consent unto you: If ye will be as we be, that every male of you be circumcised;
Only on this condition will we agree with you--that you will become as we are by every male among you being circumcised.
But here is a solution. If every man among you will be circumcised like we are,