Simply put Evangelicals differ over at least three primary things:

1. The Nature of Jesus

Evangelicals believe Jesus to be God - of one being with Father, God from God, Light from Light, true God from true God, etc... Mormons do not. Mormons believe Jesus to be divine, but a separate person from the Father. Evangelicals tend to subscribe to the historic creeds of the church - Nicene, Apostles, etc... - and are almost invariably Trinitarian.  (I cannot say that I have ever run across a non-Trinitarian Evangelical, but as it is a movement and not a denomination, there are always exceptions).

Note: In the comments, there was a notion that the creeds only adhered to the "Catholic" church.  Insofar as "catholic" is understood as "universal" or "what most people think of when they think of 'mainstream' Christianity, that is accurate.  If that were taken to mean the 'Roman Catholic Church,' that would be precise, but inaccurate, in that most Protestants and Orthodox also subscribe to the Creeds and to the Trinitarian formulations thereof.

2. The nature of the "Bible"

Evangelicals consider the canon to be closed. Mormons have their own scriptures composed well after the period.

3. The nature of soteriology

Evangelicals, by and large, believe salvation to be solely the gift of God. We believe that all who are saved entire into eternal relationship with God. Mormons believe that people are rewarded according to the nature of the covenant they believed.

What are the major differences between evangelical Christianity and Mormonism?
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