Didn't you mean to say a Protestant/Catholic debate? Please do not attempt denying the name "Christian" from the church founded by apostles of Christ himself.
There is 2000-year record of Church-claimed successor popes to Peter, Bishop of Rome and apostolic church leader since the Pentecost. There is 2000-year history of dogmatic church councils since the first of Jerusalem recorded in Acts, that according to Rome, have defined doctrine inspired by the Holy Spirit.
Can we assume that the Council of Jerusalem, where Peter orchestrated the lifting of dietary restrictions on gentile converts, represented the workings of a validly Christian church? If so, then by the rulings of which pope or dogmatic council did the Church change from Christian to non-Christian?
It is not enough to claim pagan beliefs were introduced under Constantine because the emperor was not a church leader and did not define doctrine. A council or pope interpreting scripture at some identifiable point in time has publicly defined each doctrine taught by the church.
I've posted this challenge before and received no serious attempt at response. If there is an attempt on this occasion, I offer another puzzle as extra credit.
Jesus said that the gates of Hell would not prevail against his church so there must have been no period of time since His coming that the authentic Church entirely disappeared. If Rome apostatized at some point, then what happened to the real Church? What are some names of non-Roman/Orthodox Christians from before the 1500's. Where did they live and what did they do?
Extra, extra credit: What of the famous Catholic saints who worked miracles bringing the Light to Christ to northern European pagan barbarians? Can we consider Sts. Patrick among the Irish, Aiden (martyr) among the English, Cyril (martyr) among the Slavs to be Christian?
This post is given in charity not meant to be a troll. Please reply with facts supporting your case or desist from suggesting that Roman Catholic Church is something less than Christian.