Does seeking justification by Christ make Christ a minister of sin?

In Galatians 2:17, Paul raises the question: if we seek to be justified by Christ, are we ourselves found sinners, and is Christ therefore a minister of sin? Les explains that the very idea is unthinkable—'perish the thought.' Paul then reasons in verse 18 that if he builds again the things he destroyed, he makes himself a transgressor. Les points to Paul's past as a law-keeping religious Jew and zealot who had persecuted those who accepted something contrary to the law. When Paul realized that all his law-keeping counted for nothing because the work of the cross had become preeminent, he understood that salvation is only through faith in the finished work of the cross. If he were to go back and put his converts under the law, commanding circumcision, he would be rebuilding what he tore down. Thus, seeking justification by Christ does not make Christ a minister of sin; rather, reverting to law would make Paul the transgressor.