Galatians 2:17

But if, while we seek to be justified by Christ, we ourselves also are found sinners, is therefore Christ the minister of sin? God forbid.

But if (in your retrogade theory) - seeking to be justified IN [ en (G1722)] (i:e., in believing union with) Christ (who in the Gospel theory fulfilled the law for us).

We (you and I) ourselves also (as much as the Gentiles) are found (in your and my former communion with Gentiles) sinners (such as, from the Jewish stand-point that now we resume, we should be, since we have cast aside the law, an appointed means of justification, thus having put ourselves in the same category as the Gentiles; the opposite of being justified (Galatians 2:15).

Is therefore Christ the minister of sin? (cf. 2 Corinthians 11:15) - are we to admit the conclusion, in this case inevitable, that Christ having failed to justify us by faith, so has become to us the minister of sin, by putting us in the position of "sinners," as the Judaic theory makes us, along with all others "without the law" (Romans 2:14; 1 Corinthians 9:21); and with whom, by eating with them, we have identified ourselves? The Christian revolts from so shocking a conclusion. The whole sin lies, not with Christ, but with him who necessitates such a blasphemous inference. By his false theory, though 'seeking from Christ,' we have not "found" salvation (in contradiction to Christ's own words, Matthew 7:7), but 'have been ourselves also (after all our seeking, like the Gentiles) found (Romans 7:10) sinners,' by having entered into communion with Gentiles (Galatians 2:12).