Is the Trinitarian concept of God Biblical?  The answer is no.  The Trinitarian concept of God is, the Father, Son and Holy Ghost are one God, comprised of three separate persons, of one undivided substance, in Greek "homoousious."  The concept was first created in 325 AD to combat the perceived heresy of Arius, who believed Jesus was begotten, hence created, hence a creature, not an eternal God.  The Trinitarian concept of God was also a convenient way for Christians to say they only believed in one God, and so were not polytheists.