*EDITED* LAST TIME READ THE RULES, WRONG QURAN VERSION!
The concept of the "Trinity" as originally adopted by Christianity three centuries after the departure of Jesus and taught to Christians ever since is the merging of three entities into one similar entity while remaining three distinct entities. In other words: Three bodies fold, blend, or merge into one body so that they become one entity while at the same time exhibiting the characteristics of three distinct and separate entities. It is described as "a mystery." As we just read, the first definition of the Trinity was put forth in the fourth century as follows: "...we worship one God in the trinity, and Trinity in Unity...for there is one Person of the Father, another of the Son, another of the Holy Ghost is all one... they are not three gods, but one God... the whole three persons are co-eternal and co-equal...he therefore that will be saved must thus think of the trinity..." (excerpts from the Athanasian creed).
When the Church speaks of worship, God, Jesus, and the Holy Ghost are claimed to be one being. This is because verses such as Isaiah 43:10-11 and countless others are very explicit in affirming that God Almighty is ONE. However, when they speak of "the death of God" it is Jesus (pbuh) who is claimed to have died and not God or the "Trinity." Now the three are separate. When God is described as having "begotten" a son it is not the "Trinity" nor Jesus (pbuh) which has begotten, but a distinctly separate being from the other two... there are many such examples. So how do we resolve this problem? Do we simply have blind faith or do we "love the Lord thy God … with all thy mind,"?. If we chose the later course of action then we shall first need to specify what authority we shall accept in our recognition of the true divine nature of God Almighty.
When God Almighty sends down a revelation, He addresses it to the common man, the carpenter, the blacksmith, the local merchant. God does not reveal His scriptures in a language that only the deep thinkers, the most learned scholars, and those with Ph.D.s in rocket science alone can understand. This is not to say that it is not necessary to consult people of authority in this scripture in times of difficulty regarding matters of secondary importance, however, if it were impossible for the common man to even recognize from his scripture who is God, or "who do I worship?" without extensive external influences from learned clergymen, then I am sure you will agree that not very many people shall ever be guided to the truth of this scripture and the basic message contained therein.
The matter of "who do I worship" is without a doubt the hands-down most important, nay crucial, piece of information that must be provided a reader of a divine scripture before they can accept a single word of this scripture. This matter must be made exceedingly clear to them before they can accept a single commandment. If I wish to work for a company but I do not know who is(are) my boss(s) then how can I know what he(they) want me to do? How can I know which commands to follow and which not to?