In the KJV of the Bible there are versus in The New Testament that clearly state circ is no longer required like in The Old Testament. Some things that where the law in the Old Testament changed with the laws in the New Testament and circ is one of those.
Which ever way the man is when God calls him to be saved he should stay that way. It just dosnt matter either way as long as you keep the commandments of God.
I Corinthians 7 v18-20
V18, Is any man called being circumcised? Let him not become uncircumcised. Is any called in uncircumcision? Let him not be circumcised. (If he is saved when not circed then he shouldnt become circed)
V19, Cicrumcision is nothing, and uncircumcision is nothing, but the keeping of the commandments of God. (Either way is fine as long as you follow God)
V20, Let every man abide in the same calling wherein he was called. (However you are when you are called to serve God then stay that way)
Romans 2 v26
V26, Therefore if the uncircumcision kepth the righteousness of the law, shall not his uncircumcsion be counted for circumcision?
Here is says plainly that it dosnt matter as long as you believe in Jesus.
Galatians 5 v6-15
V6, For in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.
V15, For in Christ Jesus neither circumcision availeth any thing, nor uncricumcision, but a new creature.
Christ is in all no matter what their state of being or nationality.
Colossians 3 v11V11, Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all.