DP, or "Divine Principle" is the central literature for the Unification Church (not to be confused with the Unity church) of which I was an attending member for about 5 years, and am still in regular contact with the Youth I worked with during my time there.
I leave this section up here not as an attempt to convert you, as I myself do not consider myself "Unification"; but merely as a tool to learn about other religions and other cultures on your path to building a personal relationship with God. As a Christian (which in itself is too specific for my tastes, I prefer the term "faithful believer of God"), it is our responsibility to learn and educate ourselves on the world around us, and the religions that others follow; not to necessarily partake in those, but nonetheless to become educated about what is around us.
