Nobody could be a Christian if they reject the doctrine that Jesus is the Messiah.
The hypothetical person is neither Christian or Muslim because they deny that Jesus is the Messiah and they do not attend a Mosque.
OK, good. Then in your opinion a person's religious identity is defined by the doctrines they hold, not simply the church they attend. I know you may be saying "well...Duh!" but from your previous posts it's hard to tell.
I am guided by the Holy Spirit to still believe in the Communion Of Saints meaning that I believe that there are Saints in Heaven but I do not believe that the Saints have the ability to hear anybody's prayers.
The Catholic Church, which you profess to belong to, disagrees with you. The Church claims SHE is guided by the Holy Spirit in matters of faith and morals, not individuals. Certainly, the Holy Spirit can and does guide people in personal matters, but NOT in doctrinal matters. Our role in these matters is to SUBMIT to HER authority as we would to Paul, James or Jesus Himself. This is how WE CATHOLICS think.
So, the Communion of Saints is one doctrine you disagree with the Church on. Let's keep going.
I still believe in the priesthood but I do not believe that priests conduct sacrifices. I believe that priests are just here to conduct the Mass.
That's two.
I accept the Lutheran doctrine of Holy Communion.
Three...
I am being guided by the Holy Spirit to reject and repudiate the doctrines of the Sinlessness of the Blessed Virgin Mary, the Assumption of the Blessed Virgin Mary, the doctrine of Transubstantiation, Justification By Faith through love, Faith is Scripture, Tradition and Magisterium, prayers for the dead and Purgatory.
Four through ten. You are batting .1000!!! In fact, because you "reject AND REPUDIATE" the last seven, they should count double.
Are there any specific Roman Catholic doctrines the "Holy Spirit" within you agrees with? If so, what are they?
Who is it that imposes self excommunication? I sure have not imposed self excommunication on myself.
Managers in the company I work for have a saying. "We don't fire people, they fire themselves because of the choices they make." When employees repeatedly break company policy after numerous chances, eventually they CHOOSE to no longer be part of our company. This is the same concept with the doctrine of excommunication. When you repeatedly reject Catholic dogma in favor of your own personal novelties, you are excommunicating your self. This is also the same concept used to explain how a good God can SEND someone to Hell.
And it is totally ridiculous to state that Jesus imposes excommunication
Jesus doesn't impose excommunication, the Church RECOGNIZES that a person, due to their own choices, has cut themselves off from the Body of Christ. For the fourth time, I can show you where this doctrine is taught from the Catechism. Will it make a difference?
since Jesus rejects the Catholic doctrines that are unscriptural.
As with the rest of this post, spoken like a true Protestant. You can call yourself anything you want, but your beliefs show you are no more Catholic than Jack Chick.
:biglol Where does Scripture make the claim that Jesus rejects "unscriptural doctrine"? Chapter and verse, please?