Why do Muslims insist that Christ is the false god?

guy , the usa army is shooting mortars in 1400 year old Churches in Irak, and occupying Churches all over Irak. we don't believe in polytheist themes like trinities and the such. we don't believe God has children and sends them up for crucifixion, we don't believe someone can die and magically pay for your sins. we believe in God the creator.