Hi Claire, from time to time one of his catalogs makes its way into my mail box. From looking through his catalogs when I got them I recognised his group as being nothing more than a sub-sect of theosophy which is a form of “spiritual evolution”.
google.com/custom?domains=apologeticsindex.org%3Breligionnewsblog.com&q=+theosophy&sa=Google+Search&sitesearch=www.apologeticsindex.org&client=pub-5989226684573166&forid=1&ie=ISO-8859-1&oe=ISO-8859-1&cof=GALT%3A%23008000%3BGL%3A1%3BDIV%3A%23336699%3BVLC%3A663399%3BAH%3Acenter%3BBGC%3AFFFFFF%3BLBGC%3A336699%3BALC%3A0000FF%3BLC%3A0000FF%3BT%3A000000%3BGFNT%3A0000FF%3BGIMP%3A0000FF%3BFORID%3A1&hl=en
Consequently, Steiner was invited to speak to a gathering of Theosophists.
steinerbooks.org/aboutrudolf.html
steinercollege.edu/rs.html
Steiner’s collected works include about 40 volumes of his writings and more than 300 volumes of lectures. His most notable writings include:
Philosophy of Freedom (1893) (also translated as Philosophy of Spiritual Activity): his chief philosophical work; see above.
Theosophy: An Introduction (1904), in which he sets forth his ideas of the body-soul-spirit constitution of the human being,
reincarnation, and the unity of the spiritual and sense-perceptible (“as two sides of a single coin”).
Knowledge of Higher Worlds (1904/5), in which he describes his conception of a
path of spiritual development, detailing many principles of life (openness, positivity, respect for others), spiritual exercises (control of thought and will, directed imaginations) and experiences likely to arise on this path (trials and spiritual perceptions).
An Outline of Esoteric Science (1910), in which he describes a vast panorama of
cosmic evolution, the spiritual hierarchies that guide this evolution, and the path of spiritual development that leads to such perceptions.
Steiner led the following esoteric schools:
His independent Esoteric School of the Theosophical Society, founded in 1904. This
school continued after the break with Theosophy (see below)
en.wikipedia.org/wiki/Rudolf_Steiner#Spiritual_research
If your sister beleives in reincarnation, read her Hebrews 9:27, “first death than judgement” along with Matthew 25:46 “these eternal life, the others eternal punishment”. If the Christian theology is right then when she dies, she will go to Hell. Matthew 7:22-24 “I never knew you, depart from me your evil doers”. If reincarnation is right, then Chrisitans because we live a righteous life in Christ Jesus will evolve into the next level.
I would hit on the doctrine of Sin heavy, talk to her about the commandments of God, try to get her lost by admiting her shortcomings and sins.
Romans 3:23
for all have sinned and fall short of the glory of God,
Romans 6:23
For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord.
1 John 1:8-10
8
If we claim to be without sin, we deceive ourselves and the truth is not in us. 9If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness. 10If we claim we have not sinned, we make him out to be a liar and his word has no place in our lives.
Isaiah 43:10
“You are my witnesses,” declares the LORD,
"and my servant whom I have chosen,
so that you may know and believe me
and understand that I am he.
Before me no god was formed,
nor will there be one after me.
Also, likely but I do not know, she may seperate Christ as a christ-conscieousness from the man Jesus, the way shower.
If this is the case, read the book of first John.
1 John 4
1Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world. 2This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God, 3but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.
The gnostics denied that existence of matter, they saw matter as somehow evil, and God who is pure good would not enter matter.
1 John 2:22
Who is the liar? It is the man who denies that Jesus is the Christ. Such a man is the antichrist—he denies the Father and the Son.
The gnostics of Johns time believed that a christ spirit came onto Jesus at his baptism, and left him on the cross. Today, such groups speak of Christ Consciousness that anyone can take on. It appears they use “Christ Impulse” as the term to describe this concept.