What gospel does the Catholic Church preach? Why only the death and resurrection of Our Lord Jesus Christ for the forgiveness of our sins. Stop! Period! End of story! So much so that the RCC preaches it, it is Christ's sacrifice that is the focal point of our worship service, each and every one of them. Your focal point of worship on the other hand is the pulpit, not the altar.
Yes, counter biblical traditions such as OSAS, Sola Scriptura, and hundreds if not thousands of new Christian sects with each claiming to being able to discern the real truth of it all.
You may be able to get away with that with someone who has no experience in the RCC; however, I was raised it it, and the "gospel" of the RCC is not the gospel of Christ or Paul.