However, there is a fine line, that makes the issue more complicated.
1) The virginity of Mary, the Triunity of God, the consubstantiality of the Persons of the Holy Trinity, the miracles of Jesus and other issues, over the centuries have progressively analyzed through theological conflicts and through extensive process by Church members. Let me say that all these do not constitute our faith - theology is not our faith, theology is talking about our faith, theology is an effort to express the experience of faith.
All of Christian theological doctrines and positions are the results of the human ability to process everything and to express them through words. For example, physically we all obey gravity. There was not a proper position on the issue of the gravity as a phenomenon until Newton formulated his laws for gravity. This has not changed our lives in a period before and in another period after Newton. Gravity has always operated in the same manner. It was not necessary for someone to know and to understand Newton's physics to walk on earth pulled by earth's gravitational force.
Similarly in Christian life there are some spiritual laws that define hierarchy, relationships and processes. These laws are like the law of gravity. They are not constructs of our mind, nor are symbolic theories. As the drop of a physical object from a height, has the effect for man to formulate a theory for the phenomenon of gravity, similarly for Christian issues, the wording of a theological or doctrinal position is the phrasing of a fact that has been experienced by the Church and its members. But, while we all share the same experience for gravity, for Christian issues, all do not have the same experiences. So, while Newton's law expresses a universal experience, the formulated Christian truth is not expressing a universal experience.
2) It is commonly said that in order to be a Christian you have to believe the whole package and nothing less. This seems to be logical but I think it contains an absolutism. Saints have certainly experienced a complete and authentic Christian life. They have experienced what the Christian theology talks about. But the rest of us -non saints- lack this experience. For example, when Saint Silouan pronounced the Creed: "... And in the Holy Spirit, ...", he was talking while having the experience of presonally receiving the Holy Spirit. Those of us who do not have this exprerience, we spoke about a foreign exprerience, when we repeat the same Creed. I think, this is why St Ignatius wrote: "Wherever the bishop shall appear, there let the multitude [of the people] also be; even as, wherever Jesus Christ is, there is the catholic church."
My point is that in order to be Christians we must belong to the authentic Church of saints. Our beliefs and theological acceptances are irrelevant to a large extent. Our shortcomings are corrected and perfected by the Holy Spirit in the Church. Our duty is to practically follow the life of saints, as they followed the life of Christ. We are not saved for having the right opinion about a theological issue, or for following the right worshiping practice - nor are we condemned for having a wrong theological idea. Simply put, the "Ten Commandments" - actually all commandments - have no direct theological reference, they just propose a salvific way of life.