Based on the new system of metaphysical categories developed by the author in his work “Metaphysics of the Certain” [1], an analysis of the concept of God as the ultimate existence is made. The necessity of a source of existence of something as the MEANING of a timeless and spaceless contradiction of the impossibility of absolute Nothingness is shown . Space and time are presented as forms of interpretation of existence. The limitations of evidence based on the traditional metaphysics of being and existence are shown. An analysis of basic Christian ideas as a representation of the form of the ultimate existing MEANING is carried out.