If that is your definition of "Christian", then Islam and Judaism (which you referred to before) would fit into that definition of "Christian." 
 
When the mass majority of people are referring to a "Christian" religion though, they are not using that definition.  
 
Mormonism fitting into the "Christian" Definition, no matter what that definition may be, isn't going to be the deciding factor at the "Pearly gates."  
 
What really matters is following God's Commandments and emulating Christ. Listening to his prophets and recieving the saving ordinances as proscribed by God's word.

Polytheism is generally the belief or worship of multiple gods. 
 
We believe that many gods exist (other than The Father, the Son and the Holy Ghost) however we do not worship them, we merely acknowledge there existence.  
 
The LDS church worships one God and that is God the Father. 
 
Please remember that the term Christian is not defined in the bible, but was used only by enemies of the church in reference to the followers of Jesus Christ.  
 
Are we polytheistic? I would say not, we are merely followers of Christ, according to the dictates of our own conscience.

Yes, we believe in well, multiple Gods.  
 
However, we ONLY believe in worshiping ONE God, which is God the Father.  
 
So I guess it depends on the actual defition of monotheistic. I would say we are monotheistic, because we believe all glory goes to God the Father and we fully worhsip God the Father, and no other God.

pillip, i found your answer to be a bit troubling. 
first of all, "shannon's" definiton of a christian, is in fact an accurate definition, not just personal oppinion (Christianity (from the Greek word XÁ¹ÃÄÌÂ, Khristos, "Christ", literally "anointed one") is a monotheistic religion[1] based on the life and teachings of Jesus of Nazareth as presented in the New Testament.) 
she also pointed out a similarity between christianity, islam, and judais, but it does not imply that because they are all Abrahamic religions they are the same. (just like methodists, baptists and catholics are all christians, but not the same) 
if you indeed are not a christian, wouldn't that conflict with "emulating Christ"? 
and lastly, you are right, mormonism is not a polytheistic religion, but rather a henotheistic religion (Henotheism (from the Greek heis theos or “one god”) refers to religious belief systems that accept the existence of many gods (such as polytheism) but worship one deity as supreme.) ...and no, that is not "my" definiton, its just what people have agreed the word means.

In the sense you are referring to we are not polytheist we worship the One True God, Elohim.  
 
All other gods are below him and we do not worship them we only acknowledge there existence.  
 
The Holy Bible is filled with references to the gods and how there is One True God above all others.  
 
Look at the First Commandment given to Moses. "Thou shalt have no other gods before me." The first commandment of his Covenant with Israel after delivering them from Egypt is to have no other gods before him, hence acknowledge the fact that there is other gods, but only he has the glory and power to do all things in and of himself.  
 
Hence the reason why we only worship one God not many!

I thought LDS worshipped Jesus Christ?