Mormons make it very clear that they believe that their concept of “God” means the Heavenly Father only, and not the Son nor the Holy Spirit. Thus it is logical for them to be uncomfortable with the idea of worshiping Jesus Christ.
Here is an excerpt from a speech by LDS apostle Bruce R. McConkie
We worship the Father and him only and no one else.
We do not worship the Son, and we do not worship the Holy Ghost. I know perfectly well what the scriptures say about worshipping Christ and Jehovah, but they are speaking in an entirely different sense–the sense of standing in awe and being reverentially grateful to him who has redeemed us. Worship in the true and saving sense is reserved for God the first, the Creator.
For more information, see The Mormon Mirage 3rd Edition: A Former Member Looks at the Mormon Church Today (Zondervan, 2009). Also available as an audiobook and as an expanded-text E-book for Nook, Kindle and other reading devices.