Paul is not speaking Romans about only the ceremonial law, he is talking about all the law which reveals sin(Rom.7:7)
Paul is talking about trying to keep all of the law in order to be saved, not the 'ceremonial law'.
Therefore we conclude that a man is justified by faith, without the deeds of the law(Rom.3:28)
But to him that worketh not but believeth on him that justifieth the ungodly, his faith is counted for righteousness.(Rom.4:5)
The passages are very clear-no works necessary for salvation-period.
Your argument is with some other church. My Church teaches what Paul teaches: that man is justified by faith without the works of the law.