<<Once we have been born of the Spirit-the kind necessary to see and enter the Kingdom of God-then we are spirit.>>
That certainly did not seem to be the case the last time I stubbed my toe.
<<After baptism and the laying on of hands we are only at the begettal stage, still human but impregnated with the Holy Spirit in us -begotten, but not yet born.>>
Paul said that, in baptism, we are buried in Christ's death and are raised from death to new life. That is not "begettal"; that is a death, the end of the old life, and a birth into the new life in Christ.
Death is not a "begettal" into new life. It is the end of life, not the beginning of a new life. In order to rise from that death we must be born again.
<<The final aspect of our transformation will occur at the resurrection of the dead when Jesus returns-this event completes the process of salvation.>>
All of humanity, both the believer and the unbeliever, will be raised imperishable and immortal. When Christ rose from the dead, He destroyed to power of death to hold mankind and destroy the image of God which is man. Therefore, since those who did not believe are not saved, but still will be given an immortal and imperishable body, that transformation cannot be an aspect of being "born again."
The transformation of the body of the believer is the entering into the final stage (as far as we know) of life in Christ. It is also the final stage (as far as we know) of the lost who will spend eternity separated from Christ.
However, we die with Christ and are born again at baptism. Baptism is the beginning of our life in Christ.
Rom 6:4 We were buried therefore with him by baptism into death,
so that as Christ was raised from the dead by the glory of the Father,
we too might walk in newness of life.
Col 2:12-13 ... you were buried with him in baptism, in which you were
also raised with him through faith in the working of God, who raised
him from the dead. And you, who were dead in trespasses and the
uncircumcision of your flesh, God made alive together with him, ...
At that point we are "newborn babes" in Christ, just beginning our new life in Christ, which is why Paul tells us:
Eph 4:11-14a And his gifts were that some should be apostles, some
prophets, some evangelists, some pastors and teachers, to equip the
saints for the work of ministry, for building up the body of Christ,
until we all attain to the unity of the faith and of the knowledge of the
Son of God, to mature manhood, to the measure of the stature of the
fulness of Christ; so that we may no longer be children,
So, at baptism, a believer is born again as "new-born" in Christ who then begins a journey to maturity in Christ with the goal of arriving at "mature manhood, to the measure of the stature of the fulness of Christ."