Trinitarians cannot create a shared being for God. According to Hebrews 1:3-4, the Son exactly represents the Father. The Father is the one true being, and the Son is a perfect representation of that being. There are only the Father and the Son; no additional being exists. The Father's being is singular and unique. Therefore, there is no triune God-being. The Father alone is God, and the Son is His exact representation.
