I can understand very well, because I'm fluent in ancient and modern Greek and can compare versions.
Paul, has written 3 different ways of salvation, i.e. by a) determinism b) faith alone (not by works, so that no one can boast) and c) by obeying the Law.
Paul's intention was to spread the new religion to as many Gentiles (and Jews) as possible, thus his epistles had a "gift" for everyone's beliefs , but his main bait was that faith alone saves, which caused a major disagreement with the disciples. Gentiles did not want Mosaic Law and rituals, so the "faith only saves" was welcomed by them.
"Though I am free and belong to no one, I have made myself a slave to everyone, to win as many as possible. 20 To the Jews I became like a Jew, to win the Jews. To those under the law I became like one under the law (though I myself am not under the law), so as to win those under the law. 21 To those not having the law I became like one not having the law (though I am not free from God’s law but am under Christ’s law), so as to win those not having the law. 22 To the weak I became weak, to win the weak. I have become all things to all people so that by all possible means I might save some." (Rom 9:19-22)
"But if through my lie God’s truth abounds to his glory, why am I still being condemned as a sinner?" (Rom 3:7)
Have you considered that you don't understand who Paul was?