The Answer: Without comprehending the Divine Pattern and Path of the soul within the teachings of Messiah/Christ pertaining to the Prodigal Son/Daughter, the level of spiritual maturity of Christians of the simple faith who fail to understand how the wheel of rebirth and reincarnation affects them, can be likened to a fetus in relation to a mature adult. They remain carnal and of a temporal mind, and cannot embrace the fullness of the teachings of TheWay and move on to Spiritual Maturity and dwell in the Kingdom of Origination.
Yeshua/Jesus taught the reality of the pre-existent soul that fulfills the mandate of perfection at Matt 5:48 over the course of many lifetimes. Grace, being saved by the blood of the Lamb, and the resurrection which is a central theme in Christianity today, is not for either the non-believer, cultural quasi-Christians, or those who claim to believe with their lips but are unfaithful in their manner of living -- the resurrection is only for those who pick up their cross and follow the Master of TheWay into the Inner Kingdom (Luke 17:20-21). Thus, those who walk the "narrow path" and enter into Life, are the ones who are saved. Those who walk what Yeshua/Jesus referred to as the "Broad-way" of destruction, return again to reap what they have sown. The domains of what Yeshua/Jesus called the "outer darkness... hell... prison... and the place of judgment", all represent the reality of each one of us inheriting our own works! While this aspect of Yeshua/Jesus' teachings was more clear prior to the fourth-century Church of Constantine's editing of the scriptures, it remains true that once the doctrine of preordination is properly understood, the teaching of reincarnation is the most prevalent in the Bible. Without understanding the process of how the soul evolves to a perfected state as the prodigal son returns to the Kingdom of Origination, it is impossible for the believers of the simple faith to advance past the stage of entry-level people-in-training to be Christians. A Genuine Christian is a Nazirene Disciple of TheWay who is of an Anointed (Messiah/Christ) Mind -- and therefore being Illumed by the Holy Spirit, possesses the Divine Knowledge that is referred to throughout the scriptures as the Mysteries of God.