seems pretty clear to me.
http://www.torah.org/learning/beyond-pshat/5763/tazria.html
...The Midrash at the beginning of Shemos (The Book of Exodus) tells us that the bondage in Egypt only started after the Jews stopped circumcising themselves.
The Jews wanted to identify with the Egyptians and the rest of the world who were not circumcised. At that moment Pharaoh plotted and initiated the bondage - thus enslaving the Jews until their time of redemption. G-d allowed the events to evolve and unfold as they did because the decision of the Jews to be in an uncircumcised state...
Son, I have one word for you: smegma. ‘nuff said.
The Eighth Day:
Why is the circumcision preformed specifically on the 8th day? Scientific research has proven that on the 8th day of a baby’s life his blood clots at its fastest rate. Until the 8th and from the 9th the clotting is slower, rendering the 8th day the best possible day in a human being’s life to circumcise. Some claim that this is why Hashem commanded us to perform the circumcision on this day, in order to preserve the baby’s health in the best way possible; however can we indeed claim that this is the REASON we circumcise on the 8th day, or the reverse true? Hashem ensured that the clotting reach its peak on this day, because this was the day we would have to circumcise? If so, we are back to square one - what is the reason which binds the circumcision specifically to the 8th day of a baby’s life?
http://aliyosshmuel.com/thinkjewish.asp?AID=197
Bravo - taking things out of context and across covenants. You cite and Old Covenant dictate. Perhaps you didn't notice how, in the New Covenant, such that continued circumcision as a way to "be obedient" were among those who were chastised for "falling from Grace" for trying to prove their worthiness in the face of the Savior's sacrifice. The New Covenant was a game changer.
We’re not Jewish but we have a son, and I did research on this when expecting him. Among Gentiles in the US, it became popular during the Victorian era, IIRC, because it was thought that this would control boys’ urges and make them less horny in their teen years.
In the 20th Century, it grew more popular in the baby boomer years. My older three brothers, at the beginning of the boomer years, were not circumcised. By the time the later two boys came along, it was standard procedure for all boys. Now the practice is being reconsidered again.
Circumcision is a Divine commandment to all Jewish fathers concerning all Jewish sons. Unfortunately, since you can’t talk about Divine commandments in public without sounding like Sarah Palin, the “official Jewish leadership” is going to try to make it a “like, it’s our thing, man” issue out of it.