Circumcision is an icky topic.
Some in recent years, have had it done to there child or even themselves, with the intention of an increase in hygiene.
But still the child wishes they could have had the choice.
In Middle East cultures, it is done as a Religious routine.

In the New Testament, it says do not circumcise.
Some Christians still do it anyway.
Probably because they have no intention of trying to be Jewish in the detail, that was once the norm.

Spiritual Circumcision, is where there is the love in a person, to at least try to keep the ten commands.
Some even love the detail of the old Testament and Hebrew things.

The Circumcised heart, is where matters that prevent being sensitive are removed by Gods converting a person to be more like Jesus.
In my view, this is done by the Sins being reduced, usually over many years, to a point, that God no longer needs to remember them.
This is often though not always done by the internal influence of the Councillor that Jesus the King on behalf of God sends into a person.
Atonement, can be split into three words, At One Meant, and in my view is via the Councillor sent by Jesus.

The Heart of Flesh, is the same as both of the above, except it emphasises the non lustful approach to flesh, in contrast to non believers lust of flesh.
In my view, this shows how important it is for a Christian to learn health and medicine.
Though in practice, I have had difficulty with deciding which parts of this still growing subject to study.

In regard of Circumcision, it seems to me healthy enough without it.
But the care of the smelly bacteria, does require more than just discipline.
To care needs the Counsellor of Jesus and God.