The Spiritual bone of Judeo-Christianity is Love. Love does no harm. In other words the commandments are the source of peace in the earth. Obeying them out of Love for humankind is the spiritual pinning of my religion. God's expectation of us has not changed since Adam. Perhaps I don't understand what you mean by spiritual evolution.
First, this is an idealist tripping through the pansies and daisies on a warm sunny May day view of Christianity, and not the reality of the whole beliefs, nature and problems with Christianity.
Fact, these principles, 'spiritual bone?', basis of all religions, but when taken into the context of the belief in the exclusiveness of one religion over another the concept of love may be and often is harmful to those beyond the 'chosen sense of community of the claimed one true faith, as for example where it is strongest in Judaism, Christianity and Islam in history. This includes conflict, violence, separation, and exclusion of those who believe differently, which leaves them separated and out of touch with the reality of a more evolving diverse universal relationship between God and Creation.
There are many spiritual issues in Christianity that lack consistent guidance in an evolving changing world, such as the issue of science, slavery, and the relationship between religions that believe differently. Judaism, Christianity and Islam are based on strong tribal beliefs grounded in the Bible that separate them from others.
The foundation of the belief in salvation in Christianity is grounded in the mythology of Genesis, which in turn divides Christianity in a confusion of literal versus metaphorical interpretations of scripture to address the changing scientific knowledge of our physical existence. The problem is compounded by the fact that the authors of the gospels, and the Church Fathers overwhelmingly by the majority believed in some form of a literal Genesis.
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