If you had read one more verse, you would see that Paul only put a few "laws" on Gentiles:
Act 21:25
“But concerning the Gentiles who have believed, we wrote, having decided that they should abstain from meat sacrificed to idols and from blood and from what is strangled and from fornication.”
As you can see, circumcision is not in the list. Paul is certainly and absolutely arguing against subjecting Gentiles to circumcision in Galatians.
[Gal 2:3-5 NASB] 3 But not even Titus, who was with me, though he was a Greek, was compelled to be circumcised. 4 But [it was] because of the false brethren secretly brought in, who had sneaked in to spy out our liberty which we have in Christ Jesus, in order to bring us into bondage. 5 But we did not yield in subjection to them for even an hour, so that the truth of the gospel would remain with you.
7 But on the contrary, seeing that I had been entrusted with the gospel to the uncircumcised, just as Peter [had been] to the circumcised.
[Gal 5:6 NASB] 6 For in Christ Jesus neither circumcision nor uncircumcision means anything, but faith working through love.
[Gal 6:15 NASB] 15 For neither is circumcision anything, nor uncircumcision, but a new creation.
Also we see other places where uncircumcision doesn't disqualify from being citizens of Israel in God's eyes:
[Eph 2:11-13, 19 NASB] 11 Therefore remember that formerly you, the Gentiles in the flesh, who are called "Uncircumcision" by the so-called "Circumcision," [which is] performed in the flesh by human hands-- 12 [remember] that you were at that time separate from Christ, excluded from the commonwealth of Israel, and strangers to the covenants of promise, having no hope and without God in the world. 13 But now in Christ Jesus you who formerly were far off have been brought near by the blood of Christ. ... 19 So then you are no longer strangers and aliens, but you are fellow citizens with the saints, and are of God's household,