"The Father is the one true God. This thing is certain: no one will ever ascend above Him; no one will ever replace Him. Nor will anything ever change the relationship that we, His literal offspring, have with Him. He is Elohim, the Father. He is God. Of Him there is only one. We revere our Father and our God; we worship Him." (Elder Boyd K. Packer, current President of the LDS Quorum of the Twelve Apostles.)
5 For though there be that are called gods, whether in heaven or in earth, (as there be gods many, and lords many,)
6 But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him. (1 Corinthians 8: 5-6)
"One can think what one wants of this doctrine of progressive deification, but one thing is certain: with this anthropology Joseph Smith is closer to the view of man held by the ancient Church than the precursors of the Augustinian doctrine of original sin." (Non-LDS church historian Ernst Wilhelm Benz (1907-1978), world renowned Christian Theologian and Historian, stated the previous concerning the Latter-day Saints.)
The idea of theosis is that God and humanity progressively achieve a union in Christ which in the end both blurs and preserves the distinction between Creator and creation, as in a mirror perfectly reflecting the source of its image.