Paul gave up his " from the tribe of Benjamin " ect when he became a Christian.
No, he didn't.
For example, in his epistle to the Romans, which was obviously written AFTER Paul "became a Christian", we read:
"I say then, Hath God cast away his people? God forbid. For I also am an Israelite, of the seed of Abraham, of the tribe of Benjamin." (Romans 11:1)
What is it about "I am...of the tribe of Benjamin" that you don't understand?
How many times do you have to publicly be shown that you're in error before you'll finally repent?
Of course, I realize that you were referring to the following, but, even then, you got it wrong:
Philippians chapter 3
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1] Finally, my brethren, rejoice in the Lord. To write the same things to you, to me indeed is not grievous, but for you it is safe.
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2] Beware of dogs, beware of evil workers, beware of the concision.
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3] For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus, and have no confidence in the flesh.
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4] Though I might also have confidence in the flesh. If any other man thinketh that he hath whereof he might trust in the flesh, I more:
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5] Circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, an Hebrew of the Hebrews; as touching the law, a Pharisee;
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6] Concerning zeal, persecuting the church; touching the righteousness which is in the law, blameless.
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7] But what things were gain to me, those I counted loss for Christ.
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8] Yea doubtless, and I count all things but loss for the excellency of the knowledge of Christ Jesus my Lord: for whom I have suffered the loss of all things, and do count them but dung, that I may win Christ,
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9] And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith:
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10] That I may know him, and the power of his resurrection, and the fellowship of his sufferings, being made conformable unto his death;
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11] If by any means I might attain unto the resurrection of the dead.
Here, ironically, Paul was warning the saints at Philippi to "beware of the concision", or circumcision, OR PEOPLE LIKE YOU, who have "confidence in the flesh" (vs. 3).
In the context of the same, Paul said that certain things which were once counted as "gain to me (him)", he now "counted loss for Christ" (vs. 7).
Of course, those certain things, in context, were things like his fleshly circumcision, being of the stock of Israel and the tribe of Benjamin (his national heritage), being a Hebrew of the Hebrews, being a Pharisee, etc., etc., etc. (vss. 5-6).
Anyhow, Paul didn't give up his "tribe of Benjamin" heritage.
Instead, he merely rightly recognized that it counted for nothing because all that ultimately matters is "being found in him" (vs. 9) or Christ.
Just for the record.