Semitic family. why did they say circumcision is the only option?

Circumcision: Within the jewish faith, circumcision is important part of becoming a man. The only option for religious reasons.

Ask Abraham: This was a covenant between god and abraham. Abraham was willing to sacrifice his first-born son but fortunately was told by god that a circumcision would suffice. Circumcision became part of the jewish religion from then on. Jews believe circumcision is the "will of god". Thus jews and muslims practice circumcision.