Why are many Christians antagonistic towards the idea that God has a form? Many Christian theologies from the past and present are against the idea that God has a form. The common argument I found is something like this; "God is Spirit and spirit has no form, hence God has no form".  


  Behold My hands and My feet, that it is I Myself. Handle Me and see,
  for a spirit does not have flesh and bones as you see I have.” (Luke
  24:39, NKJV)


Another popular argument is that Jesus said that spirit has no flesh and bones. However, this left me with another question, "Does the Bible say that spirit has no form?". Jesus didn't mention explicitly that spirit has no form, only that spirit has no flesh and bones.

In contrast to this, there are many verses which compels me to believe that God indeed has a form, having a head, hands and legs - God made us in his image, God sits on a throne, God speaks, God has feet, Moses saw the backside of God, God spoke to Moses as a friend, God laughs etc.

Personally, I have no problem in believing that God has a spiritual form.

1. Why is it difficult for many Christians to believe that God has a form?

2. Is this deemed as heresy by some denominations? If so, why?
Me think the following applies here:


  You shall not make for yourself a carved image, or any likeness of
  anything that is in heaven above, or that is in the earth beneath, or
  that is in the water under the earth.


That means (at least), that even if god had a form, we could not know it rightfully, for everyone that would show us how that form is like would violate the 3rd commandment.