Dualism is a non-Christian paganism which divides the human nature like you have. Spirit is seen as good, the physical body bad in many false religions. It is an attempt to negate the actual good work of God in His creation of the physical.
Man is both material and immaterial, physical and spiritual. God created man, and said it was good. That includes the physical. And He said man is said to be in the image of God.
God is partially defined as spirit, yes.
But the Bible is not so simplistic, and continues its definition of His nature in its 66 books. He is one, but within that one Deity are three separate but equal, co-eternal, co-omnipotent, co-omniscient holy Persons, said by Him to be the Father, the Son, and the Holy Spirit.
The Son came to earth, not merely taking the "form" of a human, but fully assuming a human nature along with His Divine nature. If you were in a freshman college Theology 101 course, what I am presenting to you is the basic Christian belief. These are still the descriptions after 2000 years of Scriptural examinations to define God and Jesus.
Jesus had both human and divine natures, fully man and fully God. He was fully physical,He ate, drank, could be touched, things a "form" could not do, so you have misinterpreted the meaning of that word and passage. He assumed the human nature to be our representative, the second Adam, the promised Messiah of the lineage of David, but He did not sin, so He could be our "spotless lamb" and have our sins placed upon Him. His being our Mediator opened the way for us to have access to the Father through Him.
God the Son rose from the dead physically, not just a "form," but was seen and touched and heard, and walked, and ate, and showed His disciples that God will resurrect us too when we trust in Him for His grace through Christ.
YOUR starting assumption is false, that the physical CANnot be in the image of God. It can, because Scripture informs us that it IS, and Jesus said the Scripture was inspired by God. And He should know!
Yes God is spirit.
But then we also have Jesus Himself saying, "When you have seen me, you have seen the Father." Since He rose from the dead proving He was God incarnate, He should know better than you! The Father is God. The Son is God. When we see Jesus, we see not just a human, but also God.
Oh, but you think those words can't be true, that He was only in the 'form' of a man. Well, 2000 years of examining Scripture disagrees with you on the nature of Jesus Christ.
Scripture, God's word, tells us what the "image of God" means, but you're already saying, "Oh but it doesn't mean THAT, it means..." There can be right and wrong interpretations, would you agree? Would you want to have the right understanding, rather than the wrong, as you have now?
I suggest you read "The Two Natures in Christ" by Martin Chemnitz, available at www.cph.org, because each of your false arguments is answered in far more space and detail better than I can, which is what I think you might appreciate.
Unless you are one of those Neanderthal you think are so wonderful. Then maybe just get a human to read it to you.;-)
So -- the writings of the Apostle Paul are "non-Christian paganism" ? Careful, there...
There can be right and wrong interpretations, would you agree?
I absolutely do agree -- and Satan has been pushing the self-centered misinterpretation you have chosen for a long, long time (even well before the advent of our Redeemer).
Did you ever stop to question why you get so personally angry whenever someone mentions that your body's physilcal 'form' may have "evolved" (been "formed from the dust of the earth")? Hubris. Pride. Ego-centrism. Sin.
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BTW, you never provided a single Scripture reference describing God as physically identical to man -- Michaelangelo and other "graven image" producers notwithstanding. (Did you ever read that commandment?)
My Creator (and yours, of course) left two records of His works: Scripture (a brief outline in Genesis, etc., and Creation itself -- all of it. Your egocentric, geocentric, and homocentric misinterpretation that relies solely on Scripture leads you down the deadly path of calling much of the evidence of God Almighty's creation itself a lie. God does not lie. Neither does his Word. Neither does His Creation.
You should look deeply within your own soul and discern who is the source and author of your pagan viewpoint -- that insists on squeezing Amighty, Omniscient, Omnipresent, Eternal, Invisible, Creator God -- into a sweaty, puny, aching, physical body and a timescale dictated by the spin rate of this ball of mud upon which He placed you.
Please explain why demeaning God and His mighty works to make yourself and your planet seem to be the center of His creation is anything other than wrong (and infantile). And do it with Scripture. Just claiming that the heresy has persisted as "basic Christian belief" for a long time proves nothing other than that Satan is very good at what he does.