Circumcision in itself is nothing, just another bit of body modification. It’s irrelevant to your salvation. Neither ritual conversion to Judaism nor ritual rejection of Judaism has any impact whatsoever on who you are in God’s Kingdom. These are merely works, whether good or bad, and, by themselves, works can never save you.
What you do cannot define who you are. Rather what you do is determined by who you are.
This is the true meaning behind Yeshua’s words when he said, “It isn’t what goes into a man that defiles him, but what comes out of him.” (Matthew 15:11) What comes out of a man isn’t limited to words and waste products, but also includes all the things that a man does. So that what a man does is determined by what is in his heart. The evil that is within comes out as deeds. So if a man, whose faith is in God, commits some infraction through ignorance, accident, or momentary weakness, this cannot condemn him.
Likewise, a man, whose faith is in himself, can do every action that the Law requires and still not be saved in the end. He can be circumcised, eat vegan so that he never risks eating anything unclean, give a double tithe, and volunteer every spare minute to the poor, yet still be condemned to eternal destruction because his faith is not in the Creator.
Neither circumcision nor uncircumcision counts for anything, but keeping the commandments of God. (1 Corinthians 7:19) And “keeping the commandments” includes the most important commandment of all: You will love Adonai your Elohim with all your heart, soul, mind, and strength.” (Deuteronomy 6:4-5)