Covenant of Abraham Conditional?

Someone wrote that the promises to Abraham were not conditioned on obedience.

Gen 17:9-10 And God said unto Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations.This [is] my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.

Sounds conditional on obedience to me. If you don’t circumcize, you break the covenant.